EH on a Gree heat pump: Welding protection of the auxiliary heater 1 / Welding protection of the auxiliary heater 2 / Welding protection of the water tank heater
Short answer
On a Gree heat pump, EH means: Welding protection of the auxiliary heater 1 / Welding protection of the auxiliary heater 2 / Welding protection of the water tank heater. 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: Welding protection of the auxiliary heater 1 / Welding protection of the auxiliary heater 2 / Welding protection of the water tank heater.
Part involved: auxiliary / tank electric heater contactor.
Likely causes:
- The AC contactor is damaged.
On the Versati III Monobloc (R32)
The manual says: Welding protection of the auxiliary heater 1 / Welding protection of the auxiliary heater 2 / Welding protection of the water tank heater.
Part involved: auxiliary / tank electric heater contactor.
On the Versati III Split / All-in-one (R32)
The manual says: Welding protection to the auxiliary electric heater 1 of the heat pump / Welding protection to the auxiliary electric heater 2 of the heat pump / Welding protection to the water tank electric heater.
Part involved: auxiliary / tank electric heater contactor.
On the Versati IV Monobloc (R32)
The manual says: the first internal electric heater connection Malfunction / second internal electric heater connection Malfunction / sanitary water tank electric heater connection Malfunction.
Part involved: auxiliary / tank electric heater contactor.
Likely causes:
- The AC contactor is damaged.
On the Versati IV Split / All-in-one (R32)
The manual says: Welding protection to the auxiliary electric heater 1 of the heat pump / Welding protection to the auxiliary electric heater 2 of the heat pump / Welding protection to the water tank electric heater.
Part involved: auxiliary / tank electric heater contactor.
On the Versati V R290 Monobloc
The manual says: Welding protection to the auxiliary electric heater 1 of the heat pump / Welding protection to the auxiliary electric heater 2 of the heat pump / Welding protection to the water tank electric heater.
Part involved: auxiliary / tank electric heater contactor.
Is it safe?
On the Versati II (R410A)
Switch the heat pump off at its isolator and call an engineer.
| Does the heat pump stop? | Not stated |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: no.
Manual reset: De-energize the unit and then, energize it again. If the malfunction is removed, the code will be cleared.
On the Versati III Monobloc (R32)
Switch the heat pump off at its isolator and call an engineer.
| 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)
Switch the heat pump off at its isolator and call an engineer.
| 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)
Switch the heat pump off at its isolator and call an engineer.
| Does the heat pump stop? | Not stated |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: no.
Manual reset: De-energize the unit and then, energize it again. If the malfunction is removed, the code will be cleared.
On the Versati IV Split / All-in-one (R32)
Switch the heat pump off at its isolator and call an engineer.
| 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
Switch the heat pump off at its isolator and call an engineer.
| 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 heating system pressure gauge shows the pressure your installer set (typically about 1-2 bar); if it is low, report it rather than refilling unless you have been shown how. Check any filling loop is closed.
- Check radiator valves / underfloor zones are open and thermostats are calling for heat.
- If the breaker or RCD trips repeatedly, leave the heat pump switched off and call an engineer; do not keep resetting it.
What the engineer will check
- Follow the Gree troubleshooting flowchart for this code in the service manual.
- Check the heater AC contactor for welded contacts and replace if damaged.
- Check heater and contactor wiring (electrical isolation required).
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.62 (printed; PDF p.65) · 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 (printed; PDF p.60) · 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