- Appliances
- Washing machines
F20
Miele F20 on a washer: Thermostop or heating fault
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On a Miele washer, F20 or Heating fault means the set temperature was not reached in time or the heating has a fault. Disconnect the washer for at least 2 minutes, reconnect it and restart the programme.
Safety first
Stop and check this first
- The heating element and its wiring run on mains voltage: do not open the washer or try to measure it; if an RCD also tripped, do not use it until it has been checked.
Safe checks you can perform
- Whether the programme carries on
- Disconnect for at least 2 minutes
- Details for the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Heating element and temperature sensor measurement
- Do not attempt this professional task: Heating wiring and control check
- Do not attempt this professional task: Heated programme after the repair
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Heating element and temperature sensor measurement
What they doWith the washer disconnected, the technician measures the heating element, its insulation and the temperature sensor with a multimeter and compares them with Miele's specification.
They must show youthe values measured against the specification.
In writingthe result and, if a part is replaced, its part number and the reason.
Heating wiring and control check
What they doIf element and sensor are fine, the technician checks connectors and wiring and uses the service documentation to test the board output that powers the heating.
They must show youthe state of the wiring and the board output test.
In writingwhat was found and the part replaced, if any.
Heated programme after the repair
What they doTo finish, the technician runs a heated programme and checks it reaches temperature and ends without F20.
They must show youthe full programme reaching temperature with no fault.
In writingthe test, the temperature and the date.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Whether the programme carries on
- Who:
- you, observing.
- How:
- see whether the time left has paused and wait a while without touching anything to see whether the wash resumes.
- Result that matters:
- telling the Thermostop apart from a fault.
- If the programme resumes and the time counts down again:
- it was the Thermostop; not a fault.
- If it keeps showing F20 or Heating fault:
- go on to disconnecting it.
- Evidence to keep:
- note of how long you waited and what happened.
Evidence: Anomalía de lavadora Miele F20 · Miele washing machine fault F20
Disconnect for at least 2 minutes
- Who:
- you.
- How:
- disconnect the washer by withdrawing the plug or switching off the fuse, wait at least 2 minutes, reconnect it and restart the programme, as Miele says.
- Result that matters:
- whether the fault clears once the electronics restart.
- If the programme heats and finishes:
- one-off fault; note the date.
- If the fault returns:
- contact Miele Customer Service or book a repair online.
- Evidence to keep:
- time of the disconnection and the result.
Evidence: Anomalía de lavadora Miele F20 · Miele washing machine fault F20
Details for the technician
- Who:
- you.
- How:
- note the programme and temperature chosen, whether the laundry came out cold and whether any RCD in the house tripped.
- Result that matters:
- a request that steers the heating check.
- If an RCD tripped:
- say so; do not use the washer again until it has been checked.
- If nothing tripped:
- still give the programme and temperature.
- Evidence to keep:
- notes on programme, temperature and RCD.
Evidence: Anomalía de lavadora Miele F20 · Miele washing machine fault F20
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- Miele
- Product type
- Washing machines
Known code variants
- 20
- A21
- calentador Cointra F20
- cocina LG error F20
- code erreur F20 chaudière Vaillant
- code erreur F20 lave-linge Siemens
- codice E20 Siemens
- codice F20 Vaillant
- código E20 Siemens
- Cointra F20
- Cointra water heater F20
- CPE T F20
- E00-20
- erreur E20 Siemens
- Error F20 caldera
- error F20 lavadora Siemens
- Error F20 Saunier Duval
- errore F20 caldaia Vaillant
- errore F20 lavatrice Siemens
- F 20
- F20 Siemens
- Fehlercode F20 Vaillant
- Glow worm boiler F20
- Glow worm F20
- Glow-worm F.20
- Glow-worm F20
- Glow-worm F20 overheat
- lavadora Miele anomalía de calentamiento
- LG F20 bloqueo puerta horno inferior
- LG F20 lower oven door lock
- LG horno F20
- LG oven error F20
- LG range F20
- Miele F20 no calienta
- Miele F20 not heating
- Miele lavadora F20
- Miele Thermostop
- Miele washer F20
- Miele washing machine heating fault
- panne F20 Vaillant
- Saunier Duval F20
- Siemens E20
- Siemens F20
- Siemens Fehlercode E20
- Siemens Waschmaschine Fehler F20
- Siemens washer F20
- Siemens washing machine E20
- Supreme E TS F20
- Thema NOx F20
- Vaillant boiler F20
- Vaillant F.20
- Vaillant F20
- Vaillant Fehler F20
What it means
Miele explains F20 has two sides. It can be the Thermostop: if the programme temperature is not reached within the specified time, the washer waits, the time left display pauses and the wash resumes once the temperature is reached. Or it can be a technical heating fault, in which case it asks you to disconnect the washer from the supply, wait at least 2 minutes, reconnect and restart the programme, and call Customer Service if it persists. The code does not prove the heating element is broken: temperature sensing, wiring and the board are also involved.
Warnings and stop conditions
- Mediumeditorial warning
The heating element and its wiring run on mains voltage: do not open the washer or try to measure it; if an RCD also tripped, do not use it until it has been checked.
Evidence: Anomalía de lavadora Miele F20 · Miele washing machine fault F20
Symptoms and causes
Probable causes · in order
- Thermostop in progressPossible
The washer waits to reach temperature and the time left pauses. Not a fault if the programme carries on by itself.
Evidence: Anomalía de lavadora Miele F20 · Miele washing machine fault F20
- Technical heating faultPossible
The warning returns after 2 minutes disconnected. It involves the element, temperature sensing, wiring or board, and a technician diagnoses it.
Evidence: Anomalía de lavadora Miele F20 · Miele washing machine fault F20
Virtual technician
Does F20 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Anomalía de lavadora Miele F20
Miele España · official_doc
- 2
Miele washing machine fault F20
Miele Great Britain · official_doc
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