Coffee machine — symptoms, diagnosis and maintenance
A coffee machine combines water flow, heating, grinding and milk components. Regular cleaning and descaling often prevent flow reduction.
Safety rule: stop when there is smoke, sparking, a burning smell, electric-shock signs, an active leak, cracked hob glass or suspected gas. Disconnect only when it is safe to do so.
Common symptoms
Coffee machine not dispensing coffee
The grinder may run, but little or no coffee comes out.
Symptom diagnosisCoffee machine not frothing milk
Milk stays liquid, foam is weak or the system draws air.
Symptom diagnosisCoffee machine leaking
Water appears below the machine, fills the tray unusually fast or collects inside.
Symptom diagnosisWhat to check before reporting
- Water level and correct tank seating
- Clean brew unit and outlets
- Model-appropriate descaling programme
Maintenance
Rinse the milk system after every use and descale when prompted.
Use the frequency stated in the specific model manual. Heavy use may require more frequent maintenance.
Add a planner date →How to approach coffee machine diagnosis
- Record the full model and error code.
- Identify the cycle stage or condition when it occurs.
- Check only items the manual identifies as user-accessible.
- Do not restart after a hazard signal.
- Prepare the description and previous costs before a repair decision.