E2 on a Gree heat pump: Indoor anti-frozen protetion
Short answer
On a Gree heat pump, E2 means: Indoor anti-frozen protetion. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 2 sources
What it means
On the Versati II (R410A)
The manual says: Indoor anti-frozen protetion.
Part involved: water flow switch, circulation pump, water temperature.
Likely causes:
- The resistance of temperature sensor is not correct.
- The electric expansion valve can not work normally.
- The plug on temperature sensor is not correctly connected to the socket on mainboard.
- Mainboard of outdoor unit is damaged.
On the Versati IV Monobloc (R32)
The manual says: Indoor anti-frozen protetion.
Part involved: water flow switch, circulation pump, water temperature.
Likely causes:
- The resistance of temperature sensor is not correct.
- The electronic expansion valve can not work normally.
- The plug on temperature sensor is not correctly connected to the socket on mainboard.
- Mainboard of outdoor unit is damaged.
Is it safe?
On the Versati II (R410A)
| 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: Press ON/OFF key to clear.
On the Versati IV Monobloc (R32)
| 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.
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.
- In freezing weather keep the heat pump powered on (its frost protection relies on power) and check the outdoor unit is clear of snow/ice.
What the engineer will check
- Follow the Gree troubleshooting flowchart for this code in the service manual.
- Follow the manufacturer's troubleshooting flowchart for this code.
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
- Air-to-water Heat Pump Owner's Manual (Versati IV Monobloc, SG version) ↗ · page p.55 (printed; PDF p.59) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026