E6 on a Gree heat pump: Communication malfunction(between outdoor and indoor mainboard) / Communication malfunction(between outdoor mainboard and wired controller)
Short answer
On a Gree heat pump, E6 means: Communication malfunction(between outdoor and indoor mainboard) / Communication malfunction(between outdoor mainboard and wired controller). 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 malfunction(between outdoor and indoor mainboard) / Communication malfunction(between outdoor mainboard and wired controller).
Part involved: PCB / communication wiring / settings.
Likely causes:
- The communication line of the unit is not connected.
- The communication line is not through.
- The communication line of the unit is not connected correctly.
- The two ends of communication line are not mounted with magnetic ring.
- The outdoor unit is not electrically powered.
On the Versati III Monobloc (R32)
The manual says: Communication error between indoor and outdoor unit / Communication error to the outdoor unit / Communication error to the indoor unit / Communication error to the drive.
Part involved: PCB / communication wiring / settings.
On the Versati III Split / All-in-one (R32)
The manual says: Communication error between the outdoor and indoor main boards / Communication error between the display panel and indoor main board / Communication error between the display panel and the outdoor unit.
Part involved: PCB / communication wiring / settings.
On the Versati IV Monobloc (R32)
The manual says: Communication malfunction(between outdoor and indoor mainboard0. / Communication malfunction(between outdoor mainboard and wired controller).
Part involved: PCB / communication wiring / settings.
Likely causes:
- The communication line of the unit is not connected.
- The communication line is not through.
- The communication line of the unit is not connected correctly.
- The two ends of communication line are not mounted with magnetic ring.
- The outdoor unit is not electrically powered.
On the Versati IV Split / All-in-one (R32)
The manual says: Communication error between the outdoor and indoor main boards / Communication error between the display panel and indoor main board / Communication error between the display panel and the outdoor unit.
Part involved: PCB / communication wiring / settings.
On the Versati V R290 Monobloc
The manual says: Communication error between the outdoor and indoor main boards / Communication error between the display panel and indoor main board / Communication error between the display panel and the outdoor unit.
Part involved: PCB / communication wiring / settings.
Is it safe?
On the Versati II (R410A)
| Does the heat pump stop? | Not stated |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: yes.
On the Versati III Monobloc (R32)
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
On the Versati III Split / All-in-one (R32)
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
On the Versati IV Monobloc (R32)
| Does the heat pump stop? | Not stated |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: yes.
On the Versati IV Split / All-in-one (R32)
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
On the Versati V R290 Monobloc
| 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.61 (printed; PDF p.64) · Reviewed 23 September 2026
- VERSATI III Air To Water Heat Pump (Monobloc) Service Manual ↗ · page p.121-122 (printed; PDF p.121-122) · Reviewed 23 September 2026
- Service Manual for VERSATI R32 SPLIT (VERSATI III Split Type Air To Water Heat Pump) ↗ · page p.108-109 (printed; PDF p.112-113) · Reviewed 23 September 2026
- Air-to-water Heat Pump Owner's Manual (Versati IV Monobloc, SG version) ↗ · page p.54 (printed; PDF p.58) · Reviewed 23 September 2026
- VERSATI IV Split Type Air To Water Heat Pump Service Manual ↗ · page p.66-67 (printed; PDF p.76-77) · Reviewed 23 September 2026
- VERSATI V Monobloc Type Air-to-water Heat Pump Service Manual (R290) ↗ · page p.30-31 (printed; PDF p.33-34) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026