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Gree · Heat pump

A8 Vacuum mode (menu)

Menu / mode display Gree GMV6 Mini VRF

What the display is showing

A8 puts every indoor and outdoor expansion valve and solenoid valve open so the whole pipework can be evacuated. While A8 is steady on all modules, the system cannot be started. It is for repair, not for installation, and the indoor EEVs stay open.

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

What to do

  1. Open the function menu power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select A8 (00 flashes), then press SW3; A8 goes steady.
  5. To leave, hold SW4 on the master for over 5 seconds. The mode also ends by itself after 24 hours.

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

  • A3 Defrosting
  • A4 Oil return
  • A6 Cooling/heating mode of the whole system (menu)
  • A7 Outdoor silence mode (menu)
  • A9 Set back function
  • b1 Outdoor ambient sensor open or shorted (15K)
  • b2 Defrost (coil) sensor open or shorted (20K)
  • b4 Sub-cooler liquid outlet 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 4.2.3.5 and Chapter 3 Faults, 4.1 Error Indication. Summarized in our own words; check the original manual for your model.

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.