Gree Air Conditioner C5 Error Code

Jumper cap missing or wrong on Gree air conditioners.

May need a pro

GREE indoor boards use a small plug-in jumper cap to tell the board which model it's in. C5 means the board can't read it, which almost always happens after a control board has been replaced and the jumper wasn't moved over.

Compatible models

GREE indoor units with a jumper cap on the control board. No model list is published, so check your manual.

Also shown as

C4 carries the same jumper cap meaning in GREE's list.

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 C5

Check if the board was just replaced
If C5 appeared right after a repair, call the same technician back. GREE says the jumper from the old board has to move to the new one.
Try a single reset
If no one has worked on the unit, one 10-minute power-off rules out a one-time read error.

When to call a technician

This needs a technician to fit the right jumper cap inside the indoor unit.

Parts linked to C5

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

Indoor control board

Order parts by your full model number so they fit.

Frequently asked questions

Which Gree models show the C5 code?

GREE indoor units with a jumper cap on the control board. No model list is published, so check your manual.

Can I fix Gree C5 myself?

Only the basic checks. You can safely try the steps above, but C5 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