F3 on a Gree heat pump: Refrigerant gas line temperature sensor error
Short answer
On a Gree heat pump, F3 means: Refrigerant gas line temperature sensor error. The heat pump keeps running with some functions stopped. 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: Refrigerant gas line temperature sensor error.
Part involved: temperature/pressure sensor.
Likely causes:
- The plug on temperature sensor is not correctly connected to the socket on mainboard.
- The resistance of temperature sensor is not correct.
On the Versati III Monobloc (R32)
The manual says: Remote room sensor 1.
Part involved: temperature/pressure sensor.
On the Versati III Split / All-in-one (R32)
The manual says: Remote room temperature sensor error.
Part involved: temperature/pressure sensor.
On the Versati IV Monobloc (R32)
The manual says: Gas pipe temperature sensor inside refrigerant error.
Part involved: temperature/pressure sensor.
Likely causes:
- The plug on temperature sensor is not correctly connected to the socket on mainboard.
- The resistance of temperature sensor is not correct.
On the Versati IV Split / All-in-one (R32)
The manual says: Remote room temperature sensor error.
Part involved: temperature/pressure sensor.
On the Versati V R290 Monobloc
The manual says: Remote room temperature sensor error.
Part involved: temperature/pressure sensor.
Is it safe?
On the Versati II (R410A)
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: yes.
On the Versati III Monobloc (R32)
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: unknown.
On the Versati III Split / All-in-one (R32)
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: unknown.
On the Versati IV Monobloc (R32)
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: yes.
On the Versati IV Split / All-in-one (R32)
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: unknown.
On the Versati V R290 Monobloc
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
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.
What the engineer will check
- Follow the Gree troubleshooting flowchart for this code in the service manual.
- Check sensor connector and wiring.
- Measure sensor resistance against the manual's sensor table.
- Replace sensor or PCB as indicated by the troubleshooting 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.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.55 (printed; PDF p.59) · 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