Gree Error Code F4: Outdoor Coil Sensor Failure
How to Fix Gree Code F4
- Turn off your HVAC system at the thermostat and the circuit breaker to prevent any further issues.
- Visually inspect the outdoor unit for any signs of damage or debris. If you notice any, it's best to call a professional for cleaning.
- Contact a qualified HVAC technician to diagnose and repair the issue. Do not attempt to open the unit or tamper with the electrical components.
How to Reset Gree Code F4
- Turn off the unit using the remote control or wall controller.
- Turn off the circuit breaker for the outdoor and indoor units. Wait 60 seconds.
- Restore power at the breaker.
- Turn the unit on with the remote control. If the error returns, the fault needs professional diagnosis.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Gree Error Code F4 Mean?
The F4 error code on your Gree HVAC system indicates a failure in the outdoor coil temperature sensor. This sensor is crucial for monitoring and controlling the refrigeration cycle. When it malfunctions, your system may not operate correctly, leading to reduced cooling efficiency or even system lockouts. Common causes for this issue in Gree systems include sensor damage due to dirt or debris, sensor wiring problems, or a faulty sensor itself. It's essential to address this problem promptly to prevent further damage or system failure.
Common Causes
- Dirty or blocked outdoor coil sensor
- Damaged sensor wiring
- Faulty outdoor coil temperature sensor
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The outdoor unit is running but not cooling | Measure the voltage at the outdoor coil temperature sensor using a multimeter | 0V (open circuit) or 24V (short to ground or power) |
| The outdoor unit is not running | Check for any visible damage to the sensor or its wiring | No visible damage or debris |
Applicable Gree Models
- G-Series(electric)
- NC Series(electric)
- NCA(electric)
- NCB(electric)
- NCB Series(electric)
- NCG(gas)
- NCM(electric)
- NCQ(electric)
- NCV(electric)
- NG Series(gas)
- NPC(electric)
- NPE(electric)
- NPE Series(electric)
- NSC Series(electric)
- NSE(electric)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Outdoor Coil Temperature Sensor | Gree 3010970000 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Gree model families as F4.
| Code | Description | Severity |
|---|---|---|
| C5 | Jumper/PCB Malfunction | Warning |
| E1 | High Pressure Protection | Warning |
| E3 | Low Pressure Protection | Warning |
| E5 | Over-Current Protection | Warning |
| E7 | Mode Conflict | Warning |
| F0 | Blower Temp Sensor Malfunction | Warning |
| F3 | Outdoor Ambient Sensor Failure | Warning |
| H1 | Defrost Mode (Normal) | Warning |
| H5 | IPM Protection | Warning |
| P0 | Inverter Module Protection | Warning |