Gree Air Conditioner F4 Error Code

Outdoor coil sensor fault on Gree air conditioners.

May need a pro

The sensor on the outdoor coil (GREE lists it as 20k ohm) is reading open or shorted. Without it the system can't tell when the outdoor coil needs defrosting in heat mode.

Compatible models

Listed by GREE for its heat pump mini-splits generally. You won't find a model list for it.

Also shown as

No other codes are listed for this fault.

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 F4

Time the return
Note how long it takes for F4 to come back.
Keep the coil clear
Clear snow and debris from around the outdoor unit (power off first) so it isn't fighting extra ice while you wait for service.

When to call a technician

Call a technician to test and replace the outdoor coil sensor.

Parts linked to F4

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

Order parts by your full model number so they fit.

Frequently asked questions

Which Gree models show the F4 code?

Listed by GREE for its heat pump mini-splits generally. You won't find a model list for it.

Can I fix Gree F4 myself?

Only the basic checks. You can safely try the steps above, but F4 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