F14
Miele Dishwasher
Severity: CriticalWhat Does This Error Mean?
Miele dishwasher F14 means the heating system has not raised the water to the target temperature. F14 almost always requires a technician — the flow heater, NTC temperature sensor, or control board has failed.
Affected Models
- Miele G Series Dishwasher
- Miele Active Dishwasher
- Miele Classic Plus Dishwasher
- Miele Excellence Dishwasher
- Miele AutoDos Dishwasher
Common Causes
- Failed flow heater (the main heating element in Miele dishwashers)
- Faulty NTC temperature sensor giving incorrect temperature readings
- Relay on the control board that powers the heater has failed
- Heavy limescale build-up on the heater in hard water areas
- Wiring fault between control board and heater
How to Fix It
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Reset the dishwasher.
Press and hold Start/Stop for 5 seconds to cancel the programme. Switch off at the wall for 1 minute. Restart a programme and check if F14 clears. An isolated sensor glitch can sometimes be cleared by a full power cycle.
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Run a descaling programme.
In hard water areas, limescale coats the flow heater and reduces heating efficiency. Run a Miele dishwasher descaler according to the product instructions. If F14 is caused by early-stage limescale build-up, descaling may resolve it temporarily.
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Check wash results for signs of low temperature.
If F14 clears on reset but dishes are greasy, have a plastic smell, or the drying is consistently poor, the heater is failing intermittently. Book a Miele technician before the heater fails completely.
When to Call a Professional
F14 almost always requires professional repair. The flow heater, NTC sensor, or control board relay needs to be tested and replaced by a qualified Miele technician.