F51
Miele
Heat Pump Temperature Sensor Fault
Heat-pump dryer shows F51 and may stop heating.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed evaporator or condenser NTC sensor, loose sensor mounting, wiring fault to heat pump control, defective control module
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing internal components.
Check heat pump sensors:
- Access the heat pump compartment (usually via rear or side panels).
- Locate NTC sensors clipped to the evaporator and condenser coils; ensure they are firmly attached and not dislodged.
- Inspect wiring for damage or loose connectors.
- Measure sensor resistance at room temperature and compare to specifications; replace any that are open, shorted, or out of range.
- If sensors and wiring are good, the heat pump control module may be faulty and should be tested/replaced by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Heat Pump NTC Sensor
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