HVACopedia

Gree · Heat pump

EU Compressor slowed - module running hot

Low severity Gree SapphireGree Livo GEN4Gree Vireo GEN3

What the control is telling you

Everything keeps running but the compressor speed is cut because the inverter module is too hot.

Applies to: Gree Sapphire 9-24k (SAP..HP230V1A), Livo GEN4 30-36k (4LIV..HP230V1A), Vireo GEN3 9-24k (3VIR..HP115/230V1A)

Likely causes

  • Not enough thermal paste between the IPM module and heat sink
  • Heat sink screws loose
  • High load or poor airflow at the outdoor unit
  • Board fault

Test and repair steps

  1. Warning: Kill power and let the outdoor board capacitors bleed down (about 20 min, or meter the DC bus below 20 V) before touching the inverter board.
  2. Check the thermal paste under the IPM module on AP1 and that the heat sink is tight; refresh the paste if dry.
  3. Clean the outdoor coil and clear the outdoor unit.
  4. If it keeps happening, replace AP1.

Models that show this code

12 models in Gree Sapphire, Gree Livo GEN4, Gree Vireo GEN3

3VIR09HP115V1A3VIR09HP230V1A3VIR12HP115V1A3VIR12HP230V1A3VIR18HP230V1A3VIR24HP230V1A4LIV30HP230V1AH4LIV36HP230V1AHSAP09HP230V1AHSAP12HP230V1AHSAP18HP230V1AHSAP24HP230V1AH

Other codes on the same units

  • U5 Whole-unit current sensing fault
  • U7 Reversing (4-way) valve fault
  • U8 Indoor zero-crossing signal fault
  • U9 Outdoor zero-crossing fault
  • EE EEPROM / memory chip fault
  • FH Compressor slowed - indoor coil anti-freeze
  • Fo Refrigerant recovery (pump-down) mode
  • HC PFC protection

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

Source: Gree Sapphire 9-12k (SAP09-12HP230V1A) service.pdf - section 9.1 Error Code List / 9.2 Procedure of Troubleshooting; Gree Sapphire 18-24k (SAP18-24HP230V1A) service.pdf - section 9.1 Error Code List / 9.2 Procedure of Troubleshooting; Gree Livo GEN4 30-36k (4LIV30-36HP230V1A) service.pdf - section 9.1 Error Code List / 9.2 Procedure of Troubleshooting; Gree Vireo GEN3 9-24k (3VIR..HP115-230V1A) service GREE_VIREOGEN3_SERVICE_090921.pdf - section 9.1 Error Code List / 9.2 Procedure of Troubleshooting. 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.