Gree Air Conditioner F3 Error Code

Outdoor air temperature sensor fault on Gree air conditioners.

May need a pro

The outdoor ambient sensor, a 15k ohm part on GREE units, has failed or lost its connection. The outdoor unit needs this reading to manage capacity and defrost.

Compatible models

GREE outdoor units. The FAQ gives the code without a model breakdown.

Also shown as

F4 is the outdoor coil (tube) sensor on GREE units and has its own entry.

Difficulty

Try the basic checks, but the usual fix is a technician's job.

How to fix
When to call a pro
Parts
FAQ

Not sure you are reading the code right? See how to read Gree air conditioner codes.

Safety first: unplug the air conditioner (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix Gree F3

Clear around the outdoor unit
Shut off power at the disconnect and pull leaves, snow and debris away from the outdoor unit so the sensor isn't reading a buried coil.
Check for damage outside
While the power is off, look for chewed or pulled wiring around the outdoor unit. Don't open the service cover.

When to call a technician

Sensor replacement inside the outdoor unit is technician work.

Parts linked to F3

These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.

outdoor air thermistor
outdoor control board

Order parts by your full model number so they fit.

Frequently asked questions

Which Gree models show the F3 code?

GREE outdoor units. The FAQ gives the code without a model breakdown.

Can I fix Gree F3 myself?

Only the basic checks. You can safely try the steps above, but F3 usually points to a part or fault that needs a technician.

Other Gree air conditioner codes

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

Sources we checked