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Gree · Heat pump

U9 Outdoor zero-crossing fault

High severity Gree Sapphire

What the control is telling you

The outdoor board cannot detect the supply zero-crossing.

Applies to: Gree Sapphire 9-24k (SAP..HP230V1A)

Likely causes

  • Outdoor board fault

Test and repair steps

  1. Replace the outdoor control board (AP1).

Models that show this code

4 models in Gree Sapphire

SAP09HP230V1AHSAP12HP230V1AHSAP18HP230V1AHSAP24HP230V1AH

Other codes on the same units

  • U1 Compressor phase current sensing fault
  • U3 DC bus voltage drop
  • U5 Whole-unit current sensing fault
  • U7 Reversing (4-way) valve fault
  • U8 Indoor zero-crossing signal fault
  • EE EEPROM / memory chip fault
  • EU Compressor slowed - module running hot
  • FH Compressor slowed - indoor coil anti-freeze

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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. 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.