P6 on a Gree heat pump: Communication error (drive-main)
Short answer
On a Gree heat pump, P6 means: Communication error (drive-main). The manual does not say whether the heat pump stops. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 6 sources
What it means
On the Versati II (R410A)
The manual says: Communication error (drive-main).
Part involved: PCB / communication wiring / settings.
On the Versati III Monobloc (R32)
The manual says: Drive module resetting.
Part involved: PCB / communication wiring / settings.
On the Versati III Split / All-in-one (R32)
The manual says: Communication error between the outdoor main board and the drive board.
Part involved: PCB / communication wiring / settings.
On the Versati IV Monobloc (R32)
The manual says: Communication failure (drive).
Part involved: PCB / communication wiring / settings.
On the Versati IV Split / All-in-one (R32)
The manual says: Communication error between the outdoor main board and the drive board.
Part involved: PCB / communication wiring / settings.
On the Versati V R290 Monobloc
The manual says: Communication error between the outdoor main board and the drive board.
Part involved: PCB / communication wiring / settings.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
What you can check
- Note the code shown on the controller and the unit model numbers (on the rating plate label) before contacting your installer.
- Check the heat pump's breaker/isolator at the consumer unit is on; do not open any casing.
- Check the controller display is lit; a single power cycle at the isolator may be tried only if your installer or manual allows it.
- Check controller mode/temperature/timer settings have not been changed; setup (DIP switch) errors need the installer.
What the engineer will check
- Follow the Gree troubleshooting flowchart for this code in the service manual.
- Check communication wiring, terminals and fuses between units/controller.
- Check DIP/rotary switch and address settings.
- Replace PCB if the fault persists per the flowchart.
Who to ask for: Heat pump engineer.
Certification: Heat pump installer competence; F-gas / flammable-refrigerant (R290/R32) handling competence for any refrigerant-circuit work.
What you might notice
Sources
- Air to Water Heat Pump Service Manual Versati II (T1/R410A/50Hz, GC201308-) ↗ · GC201308 · page p.63 (printed; PDF p.66) - '2) Drive Failure Code' · Reviewed 23 September 2026
- VERSATI III Air To Water Heat Pump (Monobloc) Service Manual ↗ · page p.121 (printed; PDF p.121) · Reviewed 23 September 2026
- Service Manual for VERSATI R32 SPLIT (VERSATI III Split Type Air To Water Heat Pump) ↗ · page p.108 (printed; PDF p.112) · Reviewed 23 September 2026
- Air-to-water Heat Pump Owner's Manual (Versati IV Monobloc, SG version) ↗ · page p.56-57 (printed; PDF p.60-61) - '(2) Drive failure code' · Reviewed 23 September 2026
- VERSATI IV Split Type Air To Water Heat Pump Service Manual ↗ · page p.66 (printed; PDF p.76) · Reviewed 23 September 2026
- VERSATI V Monobloc Type Air-to-water Heat Pump Service Manual (R290) ↗ · page p.30 (printed; PDF p.33) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026