Cause: Burr clogging, oily residue on chute, beans stuck, broken drive gear, faulty motor for electric models

Self Check: Empty hopper, disassemble burr for deep clean, check chute; listen for motor running sound

Repair Solution: Full burr & chute cleaning, replace worn gears / defective motor

Maintenance Tip: Clean chute every week to prevent oil buildup

Cause: Deformed burrs, loose burr screws, misaligned adjustment dial, uneven gap

Self Check: Check burr teeth damage, tighten screws, reset grind dial

Repair Solution: Calibrate burr gap, replace worn burrs, fix adjustment structure

Maintenance Tip: Never grind hard foreign objects, check screws monthly

Cause: Broken power switch, thermal cut-off, burnt motor, unlocked safety latch, broken wiring

Self Check: Check power socket, lock hopper latch, cool down 30 mins then restart

Repair Solution: Replace switch, rewire circuit, change burnt motor, fix safety lock

Cause: Foreign objects in burr, worn bearing, dry gears, loose housing, burr collision

Self Check: Empty hopper, disassemble burr to remove metal/stone debris

Repair Solution: Replace bearing, lubricate gears, tighten casing, calibrate burr gap

Cause: Heavily worn burrs, chipped burr teeth, metal sleeve abrasion

Repair Solution: Full new burr set replacement, change worn sleeve

Maintenance: Never grind beans mixed with stones or metal debris

Cause: Oily burr clog, too tight grind gap, rusted shaft, dry ball bearings

Self Check: Widen grind dial, fully clean burr & shaft

Repair: Rust removal, food-grade lubrication, gap calibration

Cause: Worn chute rubber seal, missing powder bin gasket, large gap on outlet

Repair: New rubber seal replacement, re-install dust gasket, trim chute gap

Cause: Worn adjustment gear, broken positioning spring, stripped thread

Repair: Replace adjustment core & spring, repair stripped thread

Cause: Broken cooling fan, aged motor high resistance, air vent clogged with powder

Repair: Clean vents, replace fan, full motor replacement for aged unit

Cause: Oily powder buildup, dirty dosing sensor, faulty timer PCB, uneven bean feeding

Repair: Full degrease clean, sensor wipe, repair timer circuit board

Cause: Fatigued latch spring, cracked plastic clip, loose hopper screws

Repair: Replace spring & clip parts, fasten hopper mount

Cause: Humid Hong Kong climate, residual water after cleaning, damp coffee oil buildup

Repair: Professional rust removal & polish, food-grade anti-rust lube, replace heavily rusted shaft

Maintenance: Fully air-dry after cleaning, store in dry ventilated area

Cause: Moist touch panel, aged conductive rubber, shorted main PCB, loose wiring

Repair: Dehumidify unit, replace conductive rubber, repair / change control board

Cause: Worn motor carbon brush, clogged bearing, low voltage, overloaded burr

Repair: New carbon brush replacement, bearing clean, full burr unclog

Cause: Worn shaft thread, missing lock screw, cracked plastic crank joint

Repair: Thread repair, install new lock screw, replace crank handle part

Cause: Long-term no deep clean, oxidized coffee oil stuck on burr & chute

Maintenance Repair: Use grinder cleaning tablets, full disassembly ultrasonic cleaning

Cause: Dead backup battery, faulty memory chip, loose circuit connection

Repair: Replace backup battery, fix memory PCB

Cause: Drop impact, aged brittle plastic from heat cycle

Repair: Professional plastic bonding, OEM housing replacement

Dangerous Fault: Damaged wire insulation, aged motor insulation, failed grounding

Repair: Power off inspection, re-ground unit, replace aged motor

Safety Warning: Stop using leakage grinder immediately, send for repair

Cause: Solidified internal grease, rusted shaft, oxidized damp electronic parts

Repair: Full disassembly rust clean & lubricate, circuit dehum