HVACopedia

Kinghome · Heat pump

H7 Compressor out-of-step

High severity Kinghome KM HT1DIKinghome KM HF1DIKinghome Ultranixx EcoKinghome Ultranixx

What the control is telling you

The drive cannot track rotor position, or actual speed deviates too much from the target.

Applies to: Kinghome KM09HT1DI, KM12HT1DI, KM18HT1DI, KM24HT1DI wall mini-splits; Kinghome KM09HF1DI to KM24HF1DI wall mini-splits (Gree GFH..DA/DB); 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

  • Compressor wires open, loose or reversed
  • Blocked system, low charge or low oil
  • Faulty IPM or sampling
  • Failed compressor

Test and repair steps

  1. 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.
  2. Check wires.
  3. Check charge and system.
  4. Replace the drive board or compressor.

Models that show this code

27 models in Kinghome KM HT1DI, Kinghome KM HF1DI, Kinghome Ultranixx Eco, Kinghome Ultranixx

KD24UHIKD24UHOKD30UHIKD30UHOKD36UHIKD36UHOKD42UHIKD42UHOKD48UHIKD48UHOKD60UHIKD60UHOKM09HF1DIKM09HT1DIKM12HF1DIKM12HT1DIKM18HF1DIKM18HT1DIKM21HF1DIKM24HF1DIKM24HT1DIKU24UH2IKU36UH2IKU36UHOKU48UH2IKU60UH2IKU60UHO

Other codes on the same units

  • H3 Compressor overload protection
  • H4 Overload protection (high condensing pressure)
  • H5 IPM module protection
  • H6 Fan motor feedback fault (indoor or outdoor)
  • L3 Outdoor DC fan motor fault
  • L9 Power limit protection
  • P0 Compressor minimum-frequency test / driver reset
  • P1 Compressor rated-frequency test display

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Source: Kinghome KM09-12-18-24HT1DI service manual, sec. 9.1 error code list; Kinghome KM09-24HF1DI service manual, sec. 11.1 error code list; 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.