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Gree · Heat pump

U0 Compressor preheat not finished

Low severity Gree GMV6 Mini VRF

What the control is telling you

Compressor crankcase warm-up time is not complete (8 h needed before startup).

Applies to: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V..WL/C-T(U))

Likely causes

  • Power applied too recently

Test and repair steps

  1. Keep power on for 8 hours before commissioning.

Models that show this code

3 models in Gree GMV6 Mini VRF

GMV-V36WL/C-T(U)GMV-V48WL/C-T(U)GMV-V60WL/C-T(U)

Other codes on the same units

  • P4 Compressor drive PFC protection
  • P5 Compressor phase overcurrent
  • P6 Compressor drive IPM protection
  • P7 Inverter module temperature sensor fault
  • P8 Inverter module overheated
  • P9 Inverter compressor lost synchronism
  • U2 Outdoor capacity code / jumper wrong
  • U4 Refrigerant shortage at startup

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Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section Chapter 3 Faults, 4.1 Error Indication. 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.