First Aid: Grinders & Scales

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Grinders are the underrated workhorses of your setup — and most «defects» are cleaning, zero point, or simply new beans. Here are the most common problems with grinders and barista scales, with safe steps according to manufacturer guidance: Varia, Weber Workshops, Comandante, Option-O, Eureka, Acaia, Mahlkönig and Timemore.

1. «The espresso suddenly comes out completely different from yesterday»

Most common reason: new or older beans — not a defect.

Try this first:

1. Check bean age: freshly roasted needs finer, older needs coarser.
2. Adjust the grind size in small steps — one change per attempt, going by weight and taste.
3. Note the reference value per bean (clicks/dial).
4. Clear fines from the outlet and chamber with a brush and bellows.

Sources: Comandante — FAQ · Varia — VS3 Manual (PDF)

Stop line: No disassembling "on suspicion", no work on the motor.

Go deeper: Grinder Lab · Gear: brush & bellows in Grinder Accessories

2. «The grinder is clogged — almost nothing comes out, then clumps»

1. Unplug it, empty the bean hopper.
2. Clear the outlet chute from the outside with a brush and vacuum cleaner.
3. Varia: check whether the setting is in the locked 0–1 range — set it coarser.
4. Operate the bellows several times, start a test grind coarser, then step by step finer.

Source: Varia — VS3 Manual ("blocked grind chamber") · Video: Varia — VS3 Gen 2 Deep Cleaning (official channel) · Urnex — Grindz: How to Clean a Coffee Grinder · Eureka doesn't publicly document this — our steps apply analogously; if in doubt, get in touch.

Stop line: Anything on the Eureka grind chamber beyond accessible chute cleaning = a service case.

Gear: brushes from the cleaning range · Burr cleaner: Urnex Grindz (not for super-automatic grinders with a brew chamber)

3. «After cleaning, none of the settings are right any more»

1. Varia: turn the hopper clockwise as far as it goes past "0", then back to "0" — that's the new zero point.
2. Comandante: zero = the first setting where the horizontally held crank no longer falls on its own; count clicks from there.
3. Option-O: after a burr change, carry out the zero calibration according to the official video.
4. Note the new reference values — the first few grinds are a settling-in phase.

Sources: Varia — Manual (calibration) · Option-O — User Guides · Videos: Varia — VS3 Gen 2 Calibration · Option-O — P80 Zero Calibration

Stop line: No disassembly beyond the manual's steps (bearing seat, motor shaft); never force the burr carrier into alignment.

4. «The dose fluctuates — old leftovers from yesterday come out with it»

1. Operate the bellows after every grind — that's part of the single-dose workflow.
2. Weber EG-1: remove the magnetic caps, wipe out the grind chamber — according to Weber a 30-second routine, ideally at every bean change.
3. Weekly, brush and vacuum the outlet and chamber.
4. Compare the weight in and weight out (e.g. 18 g in → 18 g out).

Sources: Weber Workshops — EG-1 Cleaning · Weber — KEY Manual · Video: Weber — EG-1 Daily Cleaning (official channel)

Stop line: The wiper system and bearings only as far as the magnetic-cap opening; electrics are off-limits.

Gear: dosing cups & bellows in Barista Accessories · Puck Prep Workshop

5. «Coffee flies everywhere and clings to the cup» (static)

From our own practice — hardly any manufacturer documents this officially:

1. RDT: 1–2 drops of water on the beans before grinding — via a spray bottle or a damp spoon back. Never spray into a running grinder.
2. Use a metal catch cup instead of plastic.
3. Let the cup sit briefly after grinding, then tap it.
4. Clean the outlet regularly — fines increase static. Dry winter air in Swiss indoor spaces makes it worse.

Stop line: No water in the container or chamber, no anti-static modifications to the electrics.

Gear: metal dosing cups (Varia/Normcore) in Barista Accessories

6. «The grinder no longer starts — or stops mid-grind»

1. Switch off immediately, unplug it, remove the beans.
2. Only open the grind chamber via the officially approved route (Varia: manual, disassembly section) and remove foreign objects — usually a small stone.
3. Vacuum the chamber, choose a coarser setting, test again.
4. Check the outlet and cable against another device.
5. If the motor still won't start: service — don't keep trying.

Source: Varia — Manual (foreign material)

Absolute limit: Motor, capacitor, circuit board, power supply — never yourself. In the case of stone damage, we check the burrs at the same time.

Request service & repairs

7. «My Comandante turns hard, grinds roughly — or the clicks confuse me»

1. With daily use, disassemble weekly and clean with a brush/compressed air — explicitly intended by the manufacturer.
2. Rinsing with water is allowed — but never soak it, never use a dishwasher, dry all parts completely. Never clean the Ironheart steel burr set wet (it's not stainless).
3. Determine the zero point: hold the grinder horizontally — the first setting where the crank no longer falls; count clicks from there.
4. A slight amount of play at the top of the crank is by design — not a defect.

Source: Comandante — FAQ · Video: Comandante — How-To Care & Clean C40 (official channel)

Stop line: Never oil or grease the axle and bearing; a bent axle = service.

Spare parts & Red Clix: Comandante Accessories · Hand Grinders

8. «The Acaia won't connect to the app — or the firmware update is stuck»

1. Switch on the scale, update the app and the smartphone's system.
2. Close all other coffee apps — the scale only holds one Bluetooth connection.
3. Android: enable location services; switch Bluetooth off and back on, keep the phone close to the scale.
4. Stuck update: close the updater app, disconnect and reconnect USB power, do a soft reset, restart the update.

Sources: Acaia — Scale doesn't connect · Acaia — Firmware update failed

Stop line: Never open the scale.

9. «The Acaia switches off mid-shot — or doesn't charge properly»

1. Adjust the sleep/auto-off timer in the settings or via the app (Lunar: 5 to 60 minutes, or off).
2. Check the charging indicator (Lunar: lightning bolt icon bottom left; Pearl S: orange lightning bolt top left).
3. Test the cable on another device — faulty cables are the most common cause.
4. Let a hot scale cool down first — the charge protection blocks charging when it's warm.
5. Charge the battery fully occasionally, don't store it empty for months.

Sources: Acaia — Lunar Manual (German, PDF) · Acaia — Charging

Stop line: Don't replace the battery yourself, don't open the housing.

Scales & accessories: Barista Scales

10. «The display jumps or drifts — the scale isn't weighing accurately any more»

1. Place it on a stable, level, vibration-free surface; eliminate drafts and fans.
2. Lunar: check the base alignment — loosen the hex screws slightly, create an even gap between the base and the tray.
3. Pearl: remove trapped packing-foam residue between the base and housing.
4. Calibrate: weigh-only mode, press the T button 6–7 times quickly until "CAL", place a 100 g calibration weight centred on the scale.

Sources: Acaia — Numbers jumping · Acaia — Calibration guide · Video: Acaia — Pearl S Smart Calibration (official channel)

Stop line: Never touch or adjust the load cell; after a drop or overload = support.

11. «My Varia VS3's grind setting shifts while grinding»

If the hopper turns while you grind and your grind setting drifts, the cause is usually the hopper thread: Varia greases it at the factory with food-safe grease. As that wears off over time, the thread slips more easily. That's maintenance, not a defect.

Try this first — in this order:

1. Unplug the grinder, unscrew the hopper anticlockwise and grease the thread again with food-safe silicone grease. Put the hopper back on, turn it to the zero point and set your grind size again.
2. If it still shifts: replace the four springs in the grind chamber. They sit below the outer burr — the VS3 manual shows step by step how to remove and refit them (sections 5.1 and 5.2). Then reset the zero point and your grind size.
3. If neither helps, sometimes the opposite does: remove the grease from the thread completely and run the VS3 without grease. The dry thread has more friction and holds the setting better. This comes from our own workshop experience and differs from Varia's recommendation (grease the thread) — so only try it once steps 1 and 2 haven't helped.

Sources: Varia — VS3 Manual (FAQ «The hopper on my VS3 is moving while grinding?», sections 5.1/5.2) · Springs & step 3: Coffee Coaching Club — our own technical/workshop experience · Video: Varia — VS3 Deep Clean / Burr Change Walkthrough (official channel)

Stop line: Only take it apart as far as the manual shows — the bottom cover stays closed, the motor and drive are off limits. Careful, the burrs are very sharp. And never switch it on at the tightest setting: that's where the burrs touch.

Gear: Renz silicone grease (food-safe) · Varia VS3 spring set

12. «Which RPM setting should I choose on the Varia VS4?»

The VS4 doesn't have a stepless speed dial, but four fixed settings (150/200/250/300 RPM). 200 RPM is a good starting point — but in the end your taste decides, not the number on the dial.

1. Start at 200 RPM as a baseline for most coffees.
2. If you're grinding light, light roasts, switch to 150 RPM — this reduces heat input and static and brings out more aromatic clarity.
3. If you want to grind faster or a coarser grind size, choose 300 RPM.
4. Feel free to experiment across the four settings. The RPM choice affects speed, heat and static — your espresso in the cup decides which setting is right for you.

Source: Varia — VS4 User Manual

Stop line: If the grinder repeatedly stops mid-grind at a particular setting for no apparent reason, don't keep experimenting endlessly — contact Varia support.

13. «My Varia VS4 won't start when I turn the dial from OFF to a speed»

From our own practice — not described in the Varia manual: if the VS4 is permanently plugged in, it goes into standby mode after a short while. If you then turn the dial from "OFF" to 150 RPM or another setting, it may not start. That's not a defect.

1. Set the dial to your speed (150, 200, 250 or 300 RPM).
2. If it doesn't start: press the dial once — on the VS4 it's also the on/off switch.
3. If the VS4 hasn't been switched on for a while, you may need to press it three times in quick succession before it starts again.
4. After grinding, turn the dial back to "OFF". Good to know: if you forget, the VS4 stops by itself after about 20 seconds without beans in the grind chamber, according to the manual.

Sources: standby behaviour — Coffee Coaching Club, our own hands-on experience · Operation & auto-stop: Varia — VS4 User Manual (sections 4.3 and 5.1)

Stop line: If it still won't start, check the socket and cable with another device — and then get in touch with us instead of opening the grinder. According to Varia, the lower chamber and drive are off limits.

14. «Which speed (RPM) suits my burr set on the Varia VS6?»

Flat and conical burrs need different speed ranges: flat runs faster, conical slower. With very dense or underdeveloped beans, a higher RPM setting can prevent a cut-out at 500 RPM.

1. With the flat burr: start at 800–1200 RPM.
2. With the 63 mm conical burr: choose a lower setting, 500–800 RPM — this delivers better results.
3. If the grinder stops at 500 RPM or shows an error, try a higher RPM setting. That's the built-in overheating protection (PTC) kicking in with very dense or underdeveloped beans.
4. Move within these ranges to suit your taste — the RPM number is a starting point, not the goal.

Source: Varia — official FAQ

Stop line: If a higher RPM setting doesn't help either and the grinder keeps stopping, don't keep experimenting endlessly — get in touch with Varia support.

15. «The Varia EVO Hybrid no longer grinds fine enough for espresso — what should I do?»

Usually the lock nut on the conical burr has loosened and the lower burr has shifted slightly outward. This can be corrected by hand without a toolbox.

1. Attach the hand crank or motor head on top so the shaft is fixed.
2. Remove the catch cup and check the lock nut at the base of the conical burr.
3. Loosen the nut slightly, push the lower burr inward and turn it until it seats noticeably.
4. Hold the burr pressed in this position and tighten the nut firmly again.

Source: Varia — official FAQ

Stop line: If the nut doesn't loosen easily or the burr jams, don't use force — contact Varia support instead.

16. «My Varia AKU scale shows an incorrect weight — how do I calibrate it?»

A noticeable measurement error can be fixed yourself on all three AKU models using the built-in calibration function — all you need is a 100 g reference weight.

1. Place the scale on a level, stable surface and zero it.
2. On the AKU and AKU mini: press the tare button 6 times to open the calibration mode, then choose the matching capacity.
3. Place a 100 g calibration weight centred on the scale and wait until "PASS" appears.
4. On the AKU PRO: instead, hold the power button to start the calibration and follow the instructions on the display.

Source: Varia — AKU Scale User Manual · Varia — AKU PRO Scale User Manual

Stop line: If "PASS" doesn't appear even after several attempts, don't keep calibrating on your own — contact Varia support instead.

17. «My Varia AKU scale won't connect via Bluetooth»

Varia hasn't published its own numbered step-by-step guide for this — only a reference to the general app instructions for the coffee app in question.

1. Update your coffee app in the App Store or Play Store.
2. Turn Bluetooth on your phone off and back on.
3. Restart the scale (turn it off and back on).
4. Close other Bluetooth devices or a second coffee app nearby — the scale only holds one connection at a time.
5. Still no connection: contact [email protected].

Source: Varia — AKU Scale User Manual · Varia — AKU PRO Bluetooth

Stop line: If it still won't connect despite an update and restart, don't open the scale yourself — contact Varia support instead.

18. «The battery won't charge, or the auto-tare function doesn't respond»

1. Use only a 5V/1–2A USB-C power adapter, never a fast charger — and don't use the scale while it's charging.
2. Test the charging cable and power adapter on another device to rule each one out individually.
3. Auto-tare only responds in certain operating modes (not available in every mode) — check the manual for the right mode.
4. Set the vessel down stably and calmly before auto-tare can trigger.
5. If liquid has already gotten in: stop charging or using it — the scales are splash-resistant (IPX5/IPX6) but not waterproof.

Source: Varia — AKU Scale User Manual

Stop line: No charging progress despite the correct power adapter, or liquid has gotten in: don't open it yourself — that's a warranty case, get in touch with us.

Mahlkönig

Mahlkönig provides instruction manuals for its grinders (on the product pages, in the «Product Downloads» tab) and shows many maintenance steps in official videos — in the «Service Videos» tab of the product pages and on the YouTube channels «Mahlkönig» and «Mahlkönig Home». According to Mahlkönig, the videos are only available in English, and Mahlkönig asks you to read the warning in each video before starting any service step. Important: Many service videos on the «Mahlkönig» channel (e.g. for the X54, E65S GbW, E80S GbW, E80W GbS and EK43) state that the instructions shown are intended exclusively for qualified technicians and trained specialist staff — and that liability and warranty claims against the manufacturer become void if an unauthorised person opens the machine. Our steps below therefore stick to what Mahlkönig describes in its instruction manuals, software manuals, quick guides and FAQ; we link to the videos as sources.

19. «My Mahlkönig hums but doesn't grind — or it's clogged»

According to Mahlkönig's troubleshooting tables, the possible causes are: a clogged grinding mechanism, a grind setting that's too fine, ground coffee that has backed up after overdosing the portafilter, or a foreign object in the grinding mechanism. For the first three causes, according to the instructions, the grinder grinds itself free again at the coarsest setting; for a foreign object, see the stop line below.

Try this first:

1. After overdosing, first clean the spout with a brush.
2. Set the grind to the coarsest setting — E64 WS: highest µm value, X64 SD: «12», X54: maximum value, EK43: coarsest step. On the E65S GbW and E80 GbW, release the grind setting lock first.
3. Start grinding — the grinder grinds itself free.
4. Then set your desired grind size while the grinder is running.
5. Prevention: on the X54, E65S GbW and E80 GbW, according to the instructions, you only adjust finer while the grinder is running; on the EK43 you only ever adjust the grind while the grinder is running; on the X64 SD, larger steps only while the motor is running. For the E65S GbW, E80 GbW and EK43, Mahlkönig also recommends that, for a finer setting, you first go about one step coarser and only then move to the target value — this way, according to the instructions, you avoid imbalances or inaccuracies in the grind setting.

Sources: Mahlkönig — E64 WS instruction manual (PDF) · X64 SD instruction manual (PDF) · X54 instruction manual (PDF) · E65S GbW instruction manual (PDF) · E80 GbW instruction manual (PDF) · EK43 instruction manual (PDF) · Mahlkönig — FAQ · Official videos: X54 | Cleaning the grinding mechanism · E65S GbW | Clean the grinding mechanism

Stop line: Never force the grind finer while beans are blocking the burrs — on the X54, according to Mahlkönig, this can damage the adjustment levers or even the burr casing. For the X64 SD, Mahlkönig warns: if you adjust the grind in larger steps while the grinder is at a standstill, you risk mechanical overload the next time you grind — in the worst case, damage to the burrs, motor and gear parts. If a foreign object is stuck in the burrs: on the X64 SD and X54 the manual says it's a job for customer service; on the other models, according to the instructions, you remove it when cleaning the grinding mechanism — if it can't be removed that way, according to Mahlkönig it's a job for the service partner. In both cases: get in touch with us.

Gear: grinder cleaner Urnex Grindz · brushes from the cleaning range

20. «My Mahlkönig won't start — the display stays dark»

1. Check the plug: according to Mahlkönig, it must be plugged into a properly installed socket.
2. Is the bean hopper seated correctly? On the E64 WS, X54 and the GbW and GbS models, the grinder won't grind without a correctly fitted hopper (X54: error message E001). If there are beans in the hopper seat, remove them — otherwise the hopper won't fit.
3. Overcurrent protection switch (on the E64 WS, X54, the GbW and GbS models and the EK43): switch the grinder off, press the tripped release button back in, switch the grinder on again. On the EK43, according to the manual, also unplug the grinder first.
4. Ground a lot in one go? On the E64 WS, the GbW and GbS models and the EK43, a motor protector also switches the grinder off when the motor gets too hot — let it cool down. According to their manuals, the E64 WS and X64 SD home grinders are built for short intervals: max. 6 seconds of grinding, 54 seconds of pause, max. 2.5 kg per day.
5. GbW and GbS models: check your household fuse and, if necessary, unplug other appliances on the same circuit. On the EK43, if the upstream fuse has tripped, the manual refers you directly to the service partner.

Sources: Mahlkönig — E64 WS instruction manual (PDF) · X64 SD instruction manual (PDF) · X54 instruction manual (PDF) · E65S GbW instruction manual (PDF) · E80 GbW instruction manual (PDF) · E65W GbS instruction manual (PDF) · EK43 instruction manual (PDF)

Stop line: If the protection switch or the fuse trips repeatedly, stop trying — according to Mahlkönig, that's a job for the service partner. Otherwise, if the overcurrent protection switch trips repeatedly, the motor winding may be damaged (as noted in the instructions for the E64 WS, the GbW and GbS models and the EK43). Never open the housing.

Request service & repairs

21. «Red display, the grinder grinds on its own — or weighs incorrectly» (E64 WS, GbW, GbS)

According to Mahlkönig's troubleshooting tables, a load cell calibration is then needed: when the display is red and when the grinder weighs inaccurately — on the E64 WS and the GbS models also when the grinder grinds on its own. If it weighs inaccurately, Mahlkönig names an unstable installation location as a further cause.

1. Use a brush to remove ground coffee from the portafilter support, portafilter holder and spout — on the E65S GbW, E80 GbW and GbS models also from the magnetically held load cell cover.
2. Place the grinder on a level, stable, vibration-free surface — vibrations and draughts distort the weight.
3. E64 WS, E65S GbW and E80 GbW: start the calibration in the «Service» menu («Calibrate load cell» or «Load Cell – Calibrate») and follow the instructions on the display. Remove the portafilter — nothing may touch the support while the grinder determines the zero point. At the end, the E64 WS shows «calibration complete» in green.
4. GbS models: according to the instruction manual, you start the calibration via the software — but according to the Grind-by-Sync software manual, the «Service» menu is reserved for technician access. For this, get in touch with us.
5. Calibration weight: according to the manuals, the E65S GbW, E80 GbW and GbS grinders are calibrated with a 1 kg weight (Mahlkönig accessory); for Grind-by-Sync, Mahlkönig shows in the «Custom Weight» video how other calibration weights can also be used with newer software (also in the «Service» menu). According to the Quick Guide, the E64 WS needs a reference weight between 400 g and 1100 g — a calibrated 1 kg weight is optionally available from Mahlkönig.
6. When? E64 WS and GbS models weekly or as needed, E65S GbW and E80 GbW every six months — and always after readjusting the portafilter support or relocating the grinder. On the E64 WS and GbS models also after cleaning the surface the grinder stands on.
7. Never lift the grinder by the portafilter support or the bean hopper — according to the manual, only by the housing, with both hands.

Sources: Mahlkönig — E64 WS instruction manual (PDF) · E64 WS Software Manual (PDF) · E64 WS Quick Guide (PDF) · E65S GbW instruction manual (PDF) · E80 GbW instruction manual (PDF) · E65W GbS instruction manual (PDF) · Grind-by-Sync Software Manual (PDF) · Official videos: E65S GbW | Load cell calibration · E65S GbW | Load cell functionality test · E80S GbW | Load cell calibration · Grind-by-Sync Load Cell Calibration Using A Custom Weight

Stop line: Nothing gets taken apart beyond the load cell cover. If the display stays red after a clean calibration or the weight keeps drifting: that's a service case — get in touch with us.

22. «The dose varies — or the grounds don't land centred in the portafilter»

1. Calibrate the load cell (see point 21) — according to Mahlkönig, this is necessary when the location has changed or the calibration interval has been exceeded.
2. Clean the spout: Mahlkönig recommends a brush with nylon bristles, on the E64 WS once a week. Remove the spout (E64 WS: turn it out of the lock and pull it down), brush out the outlet on the housing, wipe the spout with a damp cloth and dry it. Watch out for scratches: according to Mahlkönig, ground coffee sticks to them and causes dosing fluctuations.
3. If grounds have built up inside: coarsest setting, start grinding, let the grinder clear itself, then reset the grind while it's running.
4. Clean the flappers — E64 WS: silicone and metal flapper; E65S GbW and E80 GbW: every 2–5 days with lukewarm water, then dry. Mahlkönig shows in the video on the «Mahlkönig Home» channel how to open the grinding chamber on the E64 WS and reach the flappers.
5. Flapper worn? On the E65S GbW and E80 GbW, replace it when it's porous, deformed or heavily soiled. On the E64 WS, the manual says the service partner replaces a worn silicone flapper; in the video mentioned above, Mahlkönig shows how to open the grinding chamber and fit the new metal flapper.
6. If the grounds don't land centred: align the spout with your portafilter and adjust the portafilter support — E64 WS: loosen the screws until the support slides down, insert the portafilter, push the support up until the portafilter fits exactly in between, tighten the screws. Then recalibrate the load cell.
7. E64 WS: don't let the hopper run empty — according to the manual, keep at least about 1 cm of beans above the finger guard, otherwise the dose fluctuates.

Sources: Mahlkönig — E64 WS instruction manual (PDF) · E65S GbW instruction manual (PDF) · E80 GbW instruction manual (PDF) · Official videos: E64 WS: Opening the Grinder Chamber & Updating the Flapper · E64 WS Portafilter Fork · E65S GbW | Flapper replacement · E80S GbW | Flapper replacement

Stop line: A damaged spout is a service case. Only open the grinding chamber as far as your model's manual describes — on the E64 WS, whose manual doesn't describe opening it, as far as Mahlkönig shows in the video on the «Mahlkönig Home» channel. Unplug first; on the E65S GbW and E80 GbW, the manual requires gloves for manual cleaning. According to Mahlkönig, the flapper videos for the E65S GbW and E80S GbW are intended for technicians and trained specialist staff.

Gear: E64 WS flapper set · E65S flapper set · Silicone flappers 10-pack E65S/GbW · X64 SD flapper · X54 flapper

23. «My Mahlkönig no longer grinds fine enough — zero point or burrs?»

What Mahlkönig specifies, depending on the model:

• E64 WS: «Service» menu → «Calibrate Disc Distance» (fine calibration of the burr distance) and follow the display — Mahlkönig also shows this in the «E64 WS Zero Calibrate» video. For a burr replacement, the manual refers you to the service partner.
• X64 SD: Mahlkönig shows the zero-point calibration in the «X64 SD Zero Calibration» video on the «Mahlkönig Home» channel. For a burr replacement, the manual refers you to customer service.
• X54: according to the Mahlkönig FAQ, calibration is a simple process; there, Mahlkönig refers to the «X54 | Calibration» video. According to its warning, however, this video too is intended exclusively for technicians and trained specialist staff, and according to the manual, readjusting the burrs is a job for customer service — if in doubt, get in touch with us. Even at the finest setting, the X54 can't grind powder-fine for Turkish coffee.
• E65S GbW and E80 GbW: according to the manual, clean the burrs (see point 25), replace them or adjust them. After a burr replacement, Mahlkönig recommends adjusting the burrs and calibrating the Disc Distance Detector (DDD). According to Mahlkönig, the videos on this are intended for technicians and trained specialist staff.
• Grind-by-Sync (E65W/E80W GbS): according to the software manual, «Calibrate Disc Distance» is in the «Service» menu, which is reserved for technician access; Mahlkönig also shows the electronic zero-point calibration in the «Electronic Zero Calibration» video. For this, get in touch with us.
• EK43 / EK43 S: if the burrs are worn or not correctly aligned, the manual refers you to the service partner. According to Mahlkönig, the calibration videos are intended for technicians and trained specialist staff — get in touch with us.
• Wear: according to Mahlkönig, the burrs of its home grinders (E64 WS, X64 SD, X54) last about 500 kg of coffee on average. For the professional grinders, Mahlkönig recommends replacing them after about 700 kg (E65S GbW) or 1500 kg (E80 GbW) — depending on grind size, type of bean, degree of roast and the condition of the burrs.
• Burr replacement: on the E64 WS, X64 SD and X54, the manual says to go through service (X54: error code E010 = burrs worn). The E65S GbW and E80 GbW manuals describe the replacement with the optional burr replacement tool.

Sources: Mahlkönig — FAQ (home grinder burrs, X54) · E64 WS instruction manual (PDF) · E64 WS Software Manual (PDF) · X64 SD instruction manual (PDF) · X54 instruction manual (PDF) · E65S GbW instruction manual (PDF) · E80 GbW instruction manual (PDF) · Grind-by-Sync Software Manual (PDF) · EK43 instruction manual (PDF) · Official videos: E64 WS Zero Calibrate · X64 SD Zero Calibration · X54 | Calibration · E65S GbW | DDD calibration · E80S GbW | DDD calibration · E80S GbW | Grind size calibration · Grind-by-Sync: Electronic Zero Calibration · EK43 | Calibration · EK43 S | Calibration · E65S GbW | Burr replacement

Stop line: Only original Mahlkönig burrs: according to Mahlkönig, imitations can cause motor failure and void the warranty. Wear gloves when replacing the burrs — as the E65S GbW and E80 GbW manuals require.

Gear: original burrs 64 mm (X64 SD/E64 WS) · 54 mm (X54) · 65 mm (E65S) · 80 mm (E80S) · 98 mm (EK43) · all parts in the Mahlkönig range

24. «Wi-Fi, app or Sync Scale won't connect»

1. 2.4 GHz only: the E64 WS, the Grind-by-Sync grinders, X54 and Sync Scale use the 2.4 GHz band — 5 GHz won't work. For the E64 WS and Grind-by-Sync, according to the software manual, your phone should also be on the 2.4 GHz network during setup if you use a dual-band router.
2. E64 WS: menu «Connectivity» → «Connectivity Diagnosis». The diagnosis shows the chain from the grinder to the cloud; whatever is red is where it's stuck. Clicking the entry with the rotary knob shows troubleshooting suggestions. If you don't see «Connectivity»: according to the software manual, the menu only appears if you're logged in as the owner with connection rights — to do this, set a password (it may also be confirmed blank).
3. X54 with error message E002 (no Wi-Fi connection): switch the grinder off and on again, then reset the Wi-Fi setting via «rSEt». If that doesn't help: customer service.
4. Pairing the Sync Scale with a Grind-by-Sync grinder (GbS models, E64 WS): the grinder must be onboarded in the Mahlkönig Sync app and have the latest software. GbS models: under «Connectivity», activate the cloud connection in «Cloud Settings» and enable the cloud device under «Machine to Machine». E64 WS: activate the cloud via «Connectivity» → «E64 WiFi & Cloud Setup» and select «Enable Cloud Device» under «Machine to Machine». Then, in the app, select «Onboard & Sync devices» → «Syncing» → «Coffee scale», choose the scale and the grinder and confirm with «YES».
5. Fully disconnecting the Sync Scale from the network: according to Mahlkönig, removing it from the app isn't enough — also run «Reset WiFi» in the scale's setup menu.
6. Nothing works any more: factory-reset the Sync Scale as shown in the official video.

Sources: Mahlkönig — E64 WS Software Manual (PDF) · Grind-by-Sync Software Manual (PDF) · Mahlkönig — FAQ (X54 Wi-Fi) · X54 instruction manual (PDF) · Sync Scale User Manual (PDF) · Official videos: E64 WS Setup Guide: Sync App, Scale & Grind-by-Sync · X54 | WiFi connection and web server · WiFi Setup Guide for Grind-by-Sync · Sync Scale Connection and Onboarding · Sync Scale – Factory Reset

Stop line: In the grinder's web interface, only do what Mahlkönig documents (e.g. the firmware update). On the E64 WS and Grind-by-Sync, according to the software manual, everything else is reserved for technicians — a wrong configuration can permanently damage the electronics.

25. «How do I clean my Mahlkönig properly?»

1. Bean hopper: according to the manual, wipe off coffee oil daily (E64 WS, E65S GbW, E80 GbW, GbS models and EK43; X54: ideally daily with frequent use) with a damp cloth and dry it; the residues affect the taste. First close the hopper towards the burrs and grind the remaining beans empty.
2. Weekly: clean the spout with a nylon brush, wipe the housing and drip tray with a damp cloth.
3. Grinding mechanism every 2–5 days with a grinder cleaner such as GRINDZ: coarsest setting, remove the hopper, add the cleaner directly into the burrs as directed on the pack, grind it through — then grind about the same amount of coffee beans and throw both away. X54: with frequent use about weekly, at a medium setting, then grind beans through twice.
4. X64 SD: when switching beans, blow residual grounds out of the hopper with the single-dose bellows.
5. E64 WS and E65W/E80W GbS: recalibrate the load cell after cleaning the surface the grinder stands on (see point 21).
6. Off-limits according to Mahlkönig: compressed air (e.g. an air gun), water jet, steam cleaner, immersing the grinder in water; don't put the drip tray or hopper lid in the dishwasher; no sharp or metallic cleaning tools such as knives or metal scourers — they scratch the surface.

Sources: Mahlkönig — E64 WS instruction manual (PDF) · X64 SD instruction manual (PDF) · X54 instruction manual (PDF) · E80 GbW instruction manual (PDF) · E65W GbS instruction manual (PDF) · E80W GbS instruction manual (PDF) · EK43 instruction manual (PDF) · Official videos: X64 SD – Cleaning & Maintenance · E65S GbW | Maintenance cleaning · E80S GbW | Grinder cleaning · E80W GbS | Grinder Cleaning · EK43 | Maintenance cleaning · EK43 S | Maintenance cleaning

Stop line: Only open the grinding chamber if the manual describes it for your model (e.g. manual cleaning of the grinding mechanism on the E80 GbW — with gloves, according to the manual) or — on the E64 WS — as shown in the video on the «Mahlkönig Home» channel. Unplug first.

Gear: grinder cleaner Urnex Grindz · brushes from the cleaning range

26. «EK43 / EK43 S: uneven grind — centre the burrs?»

The EK43 is a commercial shop grinder — according to Mahlkönig, only trained staff may service it. Here's what you can do in everyday use:

1. Only adjust the grind while the grinder is running (scale 0 = fine to 16 = coarse); for finer settings, first go about one step coarser, then turn to the target value — this way, according to Mahlkönig, you avoid inaccuracies in the grind setting.
2. After grinding, use the lever to let the knocker tap against the spout a few times.
3. Clean the bean hopper daily and the grinding mechanism every 2–5 days with a grinder cleaner at the coarsest setting.
4. Calibration (zero point) and centring are maintenance tasks: if the burrs are worn or not correctly aligned, the manual refers you to the service partner. According to Mahlkönig, the official videos on this are intended for technicians and trained specialist staff.
5. For trained staff: according to Mahlkönig, the Mahlkönig centering tool eliminates the axial offset between the burrs and the motor shaft. The official instructions show every step — unplug, coarsest setting, remove the faceplate and the prebreaker with the rotating burr, clean all surfaces thoroughly, centre both burrs with the tool, apply the enclosed grease to the motor shaft when reassembling and tighten the faceplate alternately left and right.

Sources: Mahlkönig — EK43/EK43 S instruction manual (PDF) · EK43 centering tool — instructions (DE/EN, PDF) · Official videos: EK43 | Centering tool · EK43 S | Centering tool · EK43 | Calibration · EK43 S | Calibration · EK43 | Maintenance cleaning

Stop line: Only centre the burrs if you have training and experience — the instructions say to be very careful when opening and never to leave the grinder unattended. According to Mahlkönig, if an unauthorised person opens the machine, liability and warranty claims against the manufacturer become void. The housing stays closed — if in doubt, get in touch with us.

Gear: Mahlkönig alignment tool EK43/EK43 S · 98 mm burrs EK43

27. «X54: error code on the display, spraying — or the portafilter won't stay put»

1. Red symbol on the display: select the symbol with the jog dial and press once briefly — the error menu shows the current code.
2. E001: insert the bean hopper. E002: Wi-Fi (see point 24). E004 (LED failure) and E008: switch the grinder off and on again; if the code remains → customer service. E003 (grinder stuck in manual grind mode) and E010 (burrs worn): customer service.
3. According to Mahlkönig, a certain amount of spraying at filter grind sizes is normal and not specific to the X54 — lightly misting the beans with water before grinding helps. If it doesn't improve: clean the flapper — for this, Mahlkönig refers in its FAQ to the «X54 | Flapper replacement» video (according to its warning, this video too is intended for technicians and trained specialist staff).
4. Adjust the portafilter holder: remove the insert using the button on the right, turn it over, loosen the single screw at the bottom, set the height so your portafilter fits tightly, tighten the screw and push the insert back in all the way.
5. Grind setting (01 = fine to 35 = coarse): only adjust finer while the grinder is running.

Sources: Mahlkönig — X54 instruction manual (PDF) · Mahlkönig — FAQ (X54) · Official videos: X54 | Quick start guide · X54 | Flapper replacement · X54 | Cleaning the grinding mechanism

Stop line: Never force the setting from coarse to fine while beans are blocking the burrs — according to Mahlkönig, this can damage the adjustment levers or the burr casing.

Gear: X54 flapper · 54 mm burrs X54 · Bean hopper 0.25 kg X54/E64 WS

28. «Software update or factory reset on the E64 WS and Grind-by-Sync»

1. Automatic updates (E64 WS): when the grinder is connected to the cloud, it announces new software itself. Requirements according to Mahlkönig: a password must be set (blank or at least 8 characters with an upper-case letter, a lower-case letter and a number) and the cloud enabled via «Connectivity» → «E64 WiFi & Cloud Setup».
2. Without the cloud: update via the grinder's web interface with the .swu file from the Mahlkönig product page — step by step in the official video.
3. Factory reset (E64 WS): «Service» menu → «Factory Reset». Caution: this deletes all settings and recipes. On the GbS models, according to the software manual, the «Service» menu is reserved for technician access.
4. Forgotten password (E64 WS; according to the software manual, the same applies to the GbS models): remove the bean hopper, switch the grinder off, press and hold both buttons, switch it on and keep them pressed for 15 seconds — the factory reset page then appears for confirmation.
5. Mahlkönig shows software updates for Grind-by-Sync, the E65S GbW and E80S GbW in dedicated videos, and a reset for the E80S GbW and E80W GbS (links below). According to Mahlkönig, the videos on the E65S GbW and E80S GbW and on resetting the E80W GbS are intended for technicians and trained specialist staff.

Sources: Mahlkönig — E64 WS Software Manual (PDF) · Grind-by-Sync Software Manual (PDF) · Official videos: How to Update Your E64 WS Firmware via Web Server · Grind-by-Sync – Automatic Software Updates · E65S GbW | Software update with web server · E65S GbW | Software update without web server · E80S GbW | Software update · E80S GbW | Software reset · E80W GbS | Factory Reset

Stop line: Note down your recipes before a reset. In the web interface, only carry out the documented firmware update — according to the software manual (E64 WS, Grind-by-Sync), all other settings are reserved for technicians (risk of permanent damage to the electronics).

Timemore

Timemore provides its manuals in its Download Center and shows calibration and assembly in the official «TIMEMORE Tutorial» playlist (English). Important up front: for the Sculptor grinders and the Black Mirror scales, Timemore excludes damage caused by taking the device apart yourself from the manufacturer's warranty; for the Chestnut hand grinders, Timemore advises against taking them apart yourself — so our steps deliberately stay on the surface. For the Chestnut C5, Black Mirror DUO and Millab M01, no manual is available in the Download Center (as of September 2026) — if you have questions about them, get in touch with us directly.

29. «My Timemore Sculptor stops while grinding»

Try this first:

1. Increase the speed with the knob on the back and restart the grinder.
2. According to Timemore, grind light roasts above 1000 RPM. The range: 064/064S 800–1200 RPM, 078/078S 800–1400 RPM. Don't set the speed too low for light or hard beans — otherwise the grinder can jam.
3. Weigh the beans beforehand: the Sculptor grinds the whole dose in one go. Close the lid while grinding.
4. If it stops after one minute, that's the automatic shut-off (after 60 seconds) — not a defect. You can pause at any time with the power button.
5. Take a quick look into the hopper before filling — foreign objects don't belong there.

Sources: Timemore — Sculptor 078/078S Manual (PDF) · Sculptor 064/064S Manual (PDF)

Stop line: If it still stops at a higher speed: don't keep forcing it and don't take it apart — get in touch with us.

30. «Sculptor: which setting for espresso, filter and French press?»

Timemore gives guide values with «0» as the baseline: smaller number = finer, larger number = coarser; the red line shows the current setting. The 064 (without S) has 32 steps, the 078 (without S) 36; according to Timemore, you adjust the S models steplessly.

• 064S: Espresso 1–4 · Moka 3–5 · Pour over 8–13 · French press 13–16
• 078S: Espresso 0–5 · Moka 2–6 · Pour over 12–16 · French press 16–18
• 064: Pour over 5–12 · French press 12–16
• 078: Pour over 4–12 · French press 10–18

The values are starting points — in the end, your cup decides.

Sources: Timemore — Sculptor 064/064S Manual (Coarseness Setting, PDF) · Sculptor 078/078S Manual (PDF) · Timemore — Sculptor product page

Stop line: According to Timemore, the 064 and 078 without «S» aren't made for espresso — don't force them to espresso fineness; that's what the S versions are for.

Go deeper: Grinder Lab

31. «Cleaning the Sculptor — and may I remove the burrs?»

1. After every grind, turn the rotary knocker clockwise — it knocks the fines out of the chute.
2. Clean the grounds chute with a brush and air blower after each use.
3. Don't wash any part of the main body and never immerse the grinder in water; a soft, damp cloth is enough for the outside — then let it dry completely.
4. Deep cleaning: the manual shows how to remove the burrs (unplug, pull the adjustment dial off horizontally …) and clean them with an air blower and brush. However, Timemore advises consulting customer service or professionals for this and excludes damage caused by your own disassembly and reassembly from the warranty.
5. Official videos: according to Timemore, the «Sculptor 078/078s Assembly Tutorial» is for information only — Timemore advises against assembling the grinder yourself. The «064S Burr Assembly Tutorial» shows how to install SSP burrs in the 064S; according to the video description, Timemore's after-sales service only repairs damage from an improper replacement for a fee.

Sources: Timemore — Sculptor 078/078S Manual (PDF) · Sculptor 064/064S Manual (PDF) · Official videos: Sculptor 078/078s Assembly Tutorial · 064S Burr Assembly Tutorial

Stop line: The burrs are very sharp. We're happy to handle burr replacement or deep cleaning for you — get in touch.

Gear: replacement burrs 078 Turbo · 078S · 064 Turbo · 064S · brushes from the cleaning range

32. «My Black Mirror weighs inaccurately — how do I calibrate it?»

According to Timemore, you only need to calibrate when the scale has actually become inaccurate. Timemore also advises against leaving heavy objects on the scale for long periods — this can slightly deform the sensor.

1. Rule this out first: level, stable, vibration-free surface; don't weigh while charging (on the Basic 3, Timemore says this can reduce accuracy).
2. You'll need test weights: 20 g, 100 g, 500 g, 1 kg and 2 kg — these are the weights Timemore uses in the official calibration videos.
3. Black Mirror Mini: switch on; while «8.8.8.8» is displayed, long-press the left button and quickly press the right button 5 times → calibration mode. Then place whatever the display asks for: 100 g, 500 g, 1500 g (500 g + 1 kg); then the check steps F1 (20 g), F2 (500 g centred), F3–F6 (500 g right, top, left, bottom) and F7 (2 kg). When «End» appears, calibration is complete — switch the scale off and on again.
4. Black Mirror Basic 3: switch on; as soon as all segments light up, press and hold the Timer button and tap Tare 5 times quickly. Step «0»: leave the scale empty; then 100 g, 500 g and 1500 g, each centred. Then the check: F1 20 g centred, F2 500 g centred, F3–F6 500 g in the corners (back left, back right, front right, front left), F7 2000 g centred, F8–F11 2000 g in the same corners. Lift and reposition the weight before each step and wait for the next display each time. «End» means done — auto power-off is disabled during calibration, so switch the scale off with the slider.
5. If you can't get into calibration mode: the time window after switching on is short — switch the scale off and on again and try again.
6. Basic 2 and DUO: we can't find a calibration guide that explicitly applies to these models either in the manual or in Timemore's tutorial playlist. Watch out for mix-ups: according to its description, the «BLACK MIRROR 2.0 CALIBRATION TUTORIAL» video is for the Black Mirror 2.0 (shown with a stand and dripper ring), and the «Basic Calibration Tutorial» is for the Basic Plus. Timemore doesn't say whether these procedures also apply to the Basic 2 or DUO — please don't try it at random; get in touch with us instead.

Sources: Timemore — Black Mirror Mini Manual (PDF) · Black Mirror Basic 3 Manual (PDF) · Official videos: BLACKMIRROR mini Calibration Tutorial · Blackmirror Basic3 Calibration Tutorial · Basic Calibration Tutorial (Basic Plus — linked for its note on heavy objects)

Stop line: Never open the scale — according to Timemore, this voids the warranty, and the Basic 3 is precisely calibrated at the factory. Without the right test weights, don't calibrate — get in touch with us instead.

Gear: calibration weights 100 g · 500 g

33. «Black Mirror: modes, auto timer and grams/ounces»

1. Mini: pressing the Timer button 5 times briefly switches Regular → Pour-over → Espresso. In Pour-over mode, the Timer button starts a 3-second countdown; after that the scale tares and the time runs as soon as the weight changes. A recording only counts as a brew after more than 40 seconds and more than 50 g.
2. Mini, Espresso mode («ESP»): place your cup — the scale tares automatically and starts the timer as soon as drops fall into the cup. When you remove the cup, time and weight stop, the values flash and then reset.
3. Basic 2: Timer button 5 times in a row = auto timer on/off. Pressing the timer once starts a 3-second countdown; after that, the time starts when you begin pouring. The timer only stops automatically if more than 40 seconds have been recorded.
4. Basic 3: slide the side switch towards «M» = change mode (Regular, Pourover, Espresso). Long-press the Ratio button = ratio display on/off (not in Espresso mode). In Espresso mode, the scale wakes up as soon as the weight changes by more than 50 g.
5. Grams ↔ ounces (Mini, Basic 2): after zeroing, briefly press the power button 6 times.
6. Sound and reset: beep on/off = hold the Timer button for 5 seconds (Mini, Basic 2) or 4 seconds (Basic 3). Reset the timer = hold the Timer button for 1 second (Mini, Basic 2) or long-press it (Basic 3).
7. The buttons are capacitive — for the Mini and Basic 2, Timemore advises touching them gently rather than pressing hard. Weighing with a portafilter (Mini): flip the silicone pad over and place the portafilter on it at an angle.

Sources: Timemore — Black Mirror Mini Manual (PDF) · Black Mirror Basic 2 Manual (PDF) · Black Mirror Basic 3 Manual (PDF) · Official video: Quick Start Guide: BLACKMIRROR Basic2/mini

Stop line: If a button doesn't respond at all despite a gentle touch: don't press harder and don't open the scale — get in touch with us.

34. «My Black Mirror won't charge, switches off — or got wet»

1. Use a 5 V power adapter with 1–2 A, no fast charger (Mini, Basic 2). The Basic 3 charges at 5 V/1 A; for faster charging, Timemore recommends 5 V/2 A.
2. Not used for a long time or battery completely flat: first charge it from a computer's USB port (low charging current) until the scale responds — then charge it normally with the adapter. Timemore advises not letting the battery run completely flat in the first place.
3. Don't weigh while charging.
4. If it switches off by itself: that's the auto power-off — with the timer off, after 3 minutes of inactivity; with the timer on, after 15 minutes of inactivity (the Basic 3 goes into standby).
5. Water: according to Timemore, the surface of the Mini and Basic 2 is waterproof — even so, on all models don't let liquid get into the gaps or the charging port, and never soak the scale. The Mini and Basic 3 have a silicone cover on the charging port for this — keep it closed. Use the included silicone pad to protect it from heat.

Sources: Timemore — Black Mirror Mini Manual (PDF) · Black Mirror Basic 2 Manual (PDF) · Black Mirror Basic 3 Manual (PDF)

Stop line: Don't open it and don't replace the battery yourself — according to Timemore, this voids the warranty. If liquid has got in or the scale won't charge despite a suitable adapter: get in touch with us.

35. «Chestnut hand grinder (S3, C3 Pro, ESP, X lite): where is the zero point?»

1. Put the lid on before adjusting the grind.
2. Zero point: turn the adjustment dial clockwise to the stop — that's the starting point «0», the finest setting (on the S3 the «0» then lines up with the red mark). From there, anticlockwise = coarser (C3 Pro, ESP, X lite: count clicks; S3: read the value on the scale at the red mark).
3. S3: the locking knob on the underside of the grinder is not a grind adjuster. Always keep it fully tightened (clockwise until it won't turn any further) — only then is the «0» correct. Turned anticlockwise, it releases the inner burr.
4. Guide values from «0» — S3 (values on the adjustment dial's scale; according to the lid, 0.015 mm per click): Espresso 0–1.0 · Moka 0.5–2.0 · Pour over 5.0–8.0 · French press 8.0–9.0. In clicks: C3 Pro Espresso 7–8 · Pour over 13–16 · French press 17–20. ESP Espresso 18–24 · Moka 26–32 · Pour over 35–50 · French press 50–60. X lite Espresso 5–7 · Pour over 13–16 (recommended: 15) · French press 17–22.
5. Don't grind at the finest clicks — according to Timemore, this can damage the burrs: C3 Pro not at 0–6, ESP not at 0–10, X lite not at 0–3.
6. Don't keep turning anticlockwise endlessly: otherwise the burr set can fall out (C3 Pro, ESP). On the X lite, according to Timemore, the inner burr comes out of the body if you keep turning to the end.
7. S3: no more than 30 g of beans per load.

Sources: Timemore — Chestnut S3 Manual (PDF) · C3 Pro Manual (PDF) · ESP Manual (PDF) · X lite Manual (PDF)

Stop line: The burrs are sharp. Timemore doesn't recommend disassembling or replacing the burrs or internal parts yourself.

Go deeper: Grinder Lab · Timemore range

36. «Chestnut hand grinder: the adjustment dial is too loose or won't click — and how do I clean it?»

1. According to Timemore (S3, C3 Pro, ESP), the spring or the burrs can then get stuck: hold the grinder by the body and gently shake the handle until you hear a click.
2. If that doesn't help: unscrew the lid above the bearing, take out the whole burr set, clean it and put it back in.
3. X lite: if the dial shows «12» instead of «0» at the stop, remove the dial, refit it from the opposite direction and recalibrate. If the grind consistency gets worse: check for damaged parts; if you've removed the outer burr, it may have shifted — refit and adjust it.
4. Clean only with a brush or air blower — according to Timemore, no liquid, not even water.
5. Store in a cool, dry place.

Sources: Timemore — Chestnut S3 Manual (PDF) · C3 Pro Manual (PDF) · ESP Manual (PDF) · X lite Manual (PDF)

Stop line: If it still doesn't click cleanly afterwards, don't take it apart any further. In this case, Timemore refers you to the seller — that's us: get in touch.

Gear: brushes from the cleaning range · Hand grinders

Order number: #
Device (brand + model):
Serial number (see rating plate):
Purchased on:
Problem since:

What exactly happens:

What I've already tried (steps from the First Aid page):

Attachments: photo of rating plate / photo or video of the problem

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