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Gree · Heat pump

C4 Missing indoor units

High severity Gree GMV6 Mini VRF

What the control is telling you

Not enough indoor units are communicating (system needs at least 50% connected capacity).

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

Likely causes

  • Indoor unit without power
  • D1/D2 wiring fault

Test and repair steps

  1. Confirm 208/230 VAC at each indoor unit.
  2. Check D1/D2 wiring.

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

  • C0 Communication fault IDU/ODU/wired controller
  • C1 Main board to DC-DC controller communication fault
  • C2 Main board to compressor drive communication fault
  • C3 Main board to fan drive communication fault
  • d1 Indoor main board fault
  • d3 Indoor return air sensor open or shorted (15K)
  • d4 Indoor coil inlet pipe sensor open or shorted (20K)
  • d5 Indoor coil middle pipe sensor open or shorted (20K)

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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.