Miele Dishwasher F14 Error — Heater Fault Fix

What it means

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

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.
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.
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.

Frequently Asked Questions

Is Miele F14 the same as E09 on other brands?

Functionally yes — both indicate a wash temperature fault caused by a failed heating element or temperature sensor. The specific component names differ: Miele uses a flow heater design rather than an immersion heater, but the diagnostic and repair approach is the same.

My Miele dishwasher is 6 years old and shows F14 — is it worth repairing?

Miele dishwashers are built to last 20 years, so at 6 years old a flow heater replacement is very cost-effective. Miele technicians are authorised to repair these machines and parts are readily available. It is well worth repairing at this age.