F70
Miele
Communication Fault Between Main Control and Heat Pump Module
Dryer shows F70 and may not start.
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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
Loose communication harness, failed heat pump module, main control communication driver fault
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing internal modules.
Check module connections:
- Access the heat pump module and main control board.
- Locate the communication harness (often a multi-core low-voltage cable) between the boards.
- Reseat connectors and inspect for damage or corrosion.
- If F70 persists, either the heat pump module or main control is defective; specialized diagnostic tools are recommended to determine which module to replace.
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Repair Difficulty
Professional Required
5/5
Required Part
Heat Pump Control Module / Main Control Board
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