HVACopediaKinghome · Heat pump
A1 Outdoor fan IPM module protection
What the control is telling you
Outdoor fan inverter module fault.
Applies to: Kinghome Ultranixx Eco KD24UHO to KD60UHO outdoor units with KD..UHI air handlers
Likely causes
- Fan wire phase missing
- Overload
- Failed IPM or 15 V supply
Test and repair steps
- Warning: Switch off power at the breaker and wait for the DC bus capacitors to discharge before touching the outdoor control board or compressor wiring.
- Check fan wiring.
- Replace the drive board or fan.
Models that show this code
12 models in Kinghome Ultranixx Eco
Other codes on the same units
- C4 ODU jumper cap error
- C8 ODU drive jumper cap error
- E1 High pressure protection / high-pressure sensor fault
- E3 Low pressure protection / low-pressure sensor fault
- E4 Compressor discharge temperature too high
- F2 Sensor fault (indoor coil or outdoor condenser)
- F3 Outdoor ambient temperature sensor fault
- F4 Sensor fault (outdoor condenser or discharge)
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Source: Kinghome Ultranixx Eco KD24-60UHO service manual, sec. 3.3-3.4. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.