C5
Gree Split AC
Severity: ModerateWhat Does This Error Mean?
C5 means the jumper cap on the indoor control board is missing, wrong, or faulty. The jumper cap is a small plastic plug that tells the AC its own capacity and type. This is almost always an installation issue that a technician can fix quickly.
Affected Models
- Gree FAIRY Series
- Gree LOMO Series
- Gree U-MATCH Series
- Gree PULAR Series
- Gree Inverter Split System
Common Causes
- Jumper cap missing from the indoor PCB — fell out during installation or service
- Wrong jumper cap installed — capacity or type does not match the unit
- Jumper cap pins bent or corroded preventing good contact
- Jumper cap socket on the PCB damaged during installation
- PCB replaced without installing the correct jumper cap for the model
How to Fix It
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Turn the AC off completely and switch off at the circuit breaker.
The indoor unit contains capacitors that hold charge. Always cut power before opening the panel.
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Remove the front cover of the indoor unit to access the control board.
On most Gree units, the front panel unclips. The PCB is visible behind the filter tray. Do not touch components other than the jumper cap.
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Locate the jumper cap — it is a small coloured plastic plug (usually white or yellow) that sits on a pair of pins on the PCB.
Check your unit model number and the installation manual to confirm which jumper cap is correct for your specific model.
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If the jumper cap is present but loose, push it firmly back onto the pins until it seats securely.
A jumper cap that is not fully seated causes an intermittent C5 fault that can be hard to trace.
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If the jumper cap is missing or the wrong type, contact Gree or your installer — do not substitute a random component.
The jumper cap must be the exact part specified for your model. An incorrect cap can cause the unit to behave erratically.
When to Call a Professional
C5 almost always requires a technician to resolve correctly. The correct jumper cap must match the specific model and capacity of your unit. Installing the wrong jumper cap can cause incorrect operation even without an error code.
Frequently Asked Questions
What exactly is a jumper cap on a Gree AC?
A jumper cap is a tiny plastic plug with metal contacts that bridges two pins on the control board. It acts like a switch that tells the PCB what type and size of unit it is controlling. Gree uses it to allow one PCB design to work across multiple models.
Can C5 appear after a technician services the AC?
Yes — if the technician removed the indoor cover and accidentally dislodged the jumper cap, C5 will appear after reassembly. This is one of the most common causes of C5 on a previously working unit. Call the same technician back — it is a quick fix.
Is C5 dangerous to ignore?
The AC will not operate normally with a C5 fault active — it protects itself by refusing to run. There is no danger of equipment damage from the C5 fault itself. However, you will have no cooling or heating until the jumper cap is corrected.