Gree C5

What does Gree C5 mean?

C5 is a jumper-cap protection fault. The jumper cap that configures the control board is missing, not seated, damaged, or its detection circuit is abnormal, so the unit stops to protect itself. The display shows C5 and all loads stop operation.

Symptoms

• Display shows C5
• All loads stop operation / the complete unit stops
• Often appears after a board has been replaced or serviced
• Unit will not start

Common causes

• Jumper cap not installed on the control board
• Jumper cap not connected well (poor contact)
• Jumper cap damaged
• Detection circuit of the jumper cap on the control board is abnormal

Diagnostic steps

1. 01

   Check the jumper cap is fitted

   Confirm the control board has its jumper cap installed; if missing, insert the equipped jumper cap and see if the fault clears.

2. 02

   Reseat the jumper cap

   If the jumper cap is not inserted well, push it in tightly again and recheck.

3. 03

   Replace the jumper cap

   If reseating does not help, replace the jumper cap with a new one of the same model.

4. 04

   Replace the main board

   If the fault remains, the board's jumper-cap detection circuit is the issue — replace the main board with a new one of the same model.

When to call a professional

The jumper cap is a small configuration component on the control board; fitting or reseating it is simple but must be the correct cap for the model. Replacing the main board is technician work. If C5 persists after confirming the right jumper cap is properly seated, have a licensed HVAC technician verify the board's detection circuit.