PC
Gree Split AC
Severity: ModerateWhat Does This Error Mean?
PC means either the indoor control panel (display board) has a circuit fault, or the compressor wiring phase order is wrong. Phase mismatch is almost always an installation error. A technician can diagnose which of the two causes applies to your unit.
Affected Models
- Gree FAIRY Series
- Gree LOMO Series
- Gree U-MATCH Series
- Gree PULAR Series
- Gree Inverter Split System
Common Causes
- Indoor display board (control panel PCB) has a circuit fault or failed component
- Compressor three-phase wiring connected in the wrong order during installation
- Loose or corroded connector between the display board and the main board
- Power surge damaged the display panel circuit
- Display board firmware mismatch after a board replacement
How to Fix It
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Turn off the AC and perform a full power cycle — switch off the circuit breaker for 10 minutes.
A power cycle can resolve a temporary display board fault without any hardware replacement.
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After restoring power, check if the display panel shows the error again immediately.
If PC appears without even attempting to cool or heat, the display board itself is more likely the fault.
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Check the ribbon cable or connector linking the display panel to the indoor main board.
A loose ribbon cable is a common and easy-to-fix cause of control panel communication faults.
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If the unit was recently installed or serviced, ask the installer to check compressor wiring phase order.
Phase mismatch is a pure installation error — swapping two of the three compressor wires at the outdoor unit corrects it.
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If the unit is not new and power cycling does not help, call a technician to test both the display board and compressor wiring.
They will confirm which of the two PC causes applies and recommend the correct repair.
When to Call a Professional
Call a technician to diagnose PC — both possible causes require hands-on testing. Compressor phase wiring correction is a quick fix but requires refrigerant safety awareness. Display board replacement is straightforward but the correct part number must be used.
Frequently Asked Questions
How do I know if my Gree PC error is a display board or a wiring issue?
If the unit was recently installed and has never worked correctly, phase wiring is the more likely cause. If the unit worked fine before and PC appeared suddenly, the display board is more likely. A technician can confirm with a simple wiring check and board test.
Can I fix a compressor phase mismatch myself?
The physical fix — swapping two wires — is simple, but only a qualified technician should do it. The outdoor unit contains dangerous voltages even when switched off, and mishandling refrigerant connections is a safety risk.
Will my Gree AC cool at all when showing PC?
Usually not — PC is a fault that prevents normal operation. The unit may power on but will not start the compressor until the fault is resolved.