F0
Haier
General Sensor or Control Fault (Model-Dependent)
Dehumidifier shows F0 and does not respond to controls or will 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
Any of the temperature or humidity sensors out of range, Loose sensor harness, Control board firmware error, Corrupted configuration on PCB
How to Fix / Troubleshooting
Safety first: Unplug the unit before opening any covers.
- Full reset: Unplug the dehumidifier for 15–20 minutes. Press and hold the power button (if accessible) for 10 seconds while unplugged to discharge residual power. Plug back in and test.
- Check all sensors: Inspect the ambient temperature sensor, evaporator sensor, and humidity sensor wiring for damage or loose connectors. Reseat each connector at the PCB.
- Inspect PCB: Look for obvious damage such as burn marks, cracked solder joints, or bulging capacitors.
- Model-specific codes: Consult the Haier user manual for your exact model, as F0 may map to a specific sensor. Replace the indicated sensor if identified.
- Board replacement: If all sensors and wiring appear intact and F0 persists, the main control board may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (PCB)
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