HVACopediaKinghome · Heat pump
C4 ODU jumper cap error
What the control is telling you
The outdoor board reports the jumper cap does not match.
Applies to: Kinghome Ultranixx Eco KD24UHO to KD60UHO outdoor units with KD..UHI air handlers; Kinghome Ultranixx cold-climate KU36UHO and KU60UHO outdoor units with KU..UH2I and KD..UHI air handlers
Likely causes
- Cap missing
- Wrong cap model
- Detection circuit fault
Test and repair steps
- Install the correct jumper cap.
- Replace the board if it persists.
Models that show this code
18 models in Kinghome Ultranixx Eco, Kinghome Ultranixx
Other codes on the same units
- A1 Outdoor fan IPM module protection
- 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; Kinghome Ultranixx cold-climate KU36/60UHO service manual GC202306, 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.