E1 on a Gree heat pump: High pressure protection
Short answer
On a Gree heat pump, E1 means: High pressure protection. The heat pump stops until the fault clears or is reset. 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: High pressure protection.
Part involved: compressor, pressure switches, expansion valve, refrigerant charge.
Likely causes:
- Comp High-pressure switch is broken or the wiring is loose.
- The water in the tank is not enough.
- The installation of tank temp sensor is not correct.
- The gas valve and liquid valve are not fully open.
- The electric expansion valve can not work normally.
On the Versati III Monobloc (R32)
The manual says: High pressure protection.
Part involved: compressor, pressure switches, expansion valve, refrigerant charge.
On the Versati III Split / All-in-one (R32)
The manual says: High pressure protection.
Part involved: compressor, pressure switches, expansion valve, refrigerant charge.
On the Versati IV Monobloc (R32)
The manual says: Comp High-pressure protection.
Part involved: compressor, pressure switches, expansion valve, refrigerant charge.
Likely causes:
- Comp High-pressure switch is broken or the wiring is loose.
- The water in the tank is not enough.
- The installation of tank temp sensor is not correct.
- The gas valve and liquid valve are not fully open.
- The electronic expansion valve can not work normally.
On the Versati IV Split / All-in-one (R32)
The manual says: High pressure protection.
Part involved: compressor, pressure switches, expansion valve, refrigerant charge.
Likely causes:
- High-pressure switch broken or its wiring loose.
- Not enough water in the tank / system.
- Tank temperature sensor incorrectly installed.
- Gas and liquid valves not fully open.
- Electronic expansion valve not working.
On the Versati V R290 Monobloc
The manual says: High pressure protection.
Part involved: compressor, pressure switches, expansion valve, refrigerant charge.
Is it safe?
On the Versati II (R410A)
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
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)
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: unknown.
On the Versati III Split / All-in-one (R32)
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: unknown.
On the Versati IV Monobloc (R32)
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
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)
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: unknown.
On the Versati V R290 Monobloc
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
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 outdoor unit is not blocked by leaves, debris, snow or ice and that nothing is stored against the grilles.
What the engineer will check
- Follow the Gree troubleshooting flowchart for this code in the service manual.
- Check refrigerant pressures and charge (F-gas / flammable refrigerant competent person only).
- Check expansion valve, pressure switches/sensors and discharge temperature.
- Check outdoor coil airflow and blockages.
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.60 (printed; PDF p.63) · 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.54 (printed; PDF p.58) · 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