F4
Gree
Outdoor Ambient Temperature Sensor Fault
The indoor unit displays F4; the unit may stop heating or cooling; this is often related to the outdoor ambient temperature sensor.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted outdoor ambient sensor, sensor dislodged from its mounting point, damaged sensor wiring harness, or a faulty outdoor PCB.
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker before opening the outdoor unit.
- Step 1 – Locate ambient sensor: On many Gree units, the ambient sensor is mounted near the outdoor air intake grille, often hanging in free air on a small bracket.
- Step 2 – Check mounting and exposure: Ensure the sensor is not touching hot surfaces and is exposed to outdoor air. Reposition if necessary.
- Step 3 – Inspect wiring and connector: Follow the sensor cable to the outdoor PCB and verify the connector is secure and the wires are intact.
- Step 4 – Replace sensor: If the sensor body is cracked or corroded, replace it with the correct Gree ambient sensor.
- Step 5 – If F4 remains: The outdoor PCB may not be reading the sensor correctly and should be tested/replaced by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Ambient Temperature Sensor
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