Gree Air Conditioner
Gree AC F3 error
Outdoor air temperature sensor fault
Try a reset once. If it comes back, a trained technician should repair it.
What it means
The control board is getting a wrong reading, or no reading, from the outdoor air temperature sensor. Usually the sensor, its wire or its plug is loose, damaged or has failed.
Common causes
- Loose or rusted sensor plug on the control board
- Sensor wire cut, pinched or bitten by rats
- Sensor has failed (open or short circuit)
- Less often, a fault on the control board
Try this at home first
Tick each step as you go
When to call a technician
If the code returns after a reset, a technician needs to test and usually replace the sensor. It is a common, low-cost repair.
Safety first
Always switch off at the wall socket or MCB before touching any part. Do not open the outdoor unit, control boards or gas pipes yourself — they carry high voltage and pressure.
Frequently asked questions
What does F3 mean on a Gree Air Conditioner?
Outdoor air temperature sensor fault. The control board is getting a wrong reading, or no reading, from the outdoor air temperature sensor. Usually the sensor, its wire or its plug is loose, damaged or has failed.
Can I fix Gree Air Conditioner error F3 myself?
You can try a reset first: Switch off at the wall socket or MCB for 5 minutes, then restart. If the code returns, call a technician.
Is it safe to keep using the Air Conditioner with F3?
Avoid repeated restarts; running with this fault can cause more damage.
Other Gree AC codes
Same code on other brands
Sources
We write every explanation in our own words from these references.
Last checked: 2026-10-20