Gree Heat Pump: Start vacuum mode for evacuating pipework (function A8)
Start vacuum mode for evacuating pipework (function A8) on a Gree heat pump: Opens every indoor and outdoor expansion and solenoid valve so the whole system can be evacuated; the system cannot be started while A8 is steady. It ends by itself after 24 hours.
Applies to: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V..WL/C-T(U))
How to fix start vacuum mode for evacuating pipework (function a8): step by step
- Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
- Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
- SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
- Select A8 (00 flashes), then press SW3; A8 goes steady.
- To leave, hold SW4 on the master for over 5 seconds. The mode also ends by itself after 24 hours.
If the unit shows an error code, look it up: Gree Heat Pump codes
Models
GMV-V36WL/C-T(U)GMV-V48WL/C-T(U)GMV-V60WL/C-T(U)
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. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.