In brief

Fault code C5 on Gree Split / U-Match means: Code C5 is a pure configuration error. On the PCB, a small jumper cap (plastic plug with a wire) defines the unit size. If it is missing, the air conditioning will not start. Most common cause: Jumper cap omitted during PCB replacement, or incorrectly inserted at the factory. First action: Open the indoor unit.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).

According to the Gree PCB Configuration Guide, code C5 is triggered by a missing or incorrectly inserted jumper cap on the main PCB, which prevents the system from starting.

C5 • Gree • Split / U-Match

Fault Code C5 Gree: Missing Jumper Cap

Code C5 is a pure configuration error. On the PCB, a small jumper cap (plastic plug with a wire) defines the unit size. If it is missing, the air conditioning will not start.

Source: Gree PCB Configuration Guide · Updated on 19 June 2026

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What does fault code C5 on Gree mean?

Code C5 is a pure configuration error. On the PCB, a small jumper cap (plastic plug with a wire) defines the unit size. If it is missing, the air conditioning will not start.

Jumper cap omitted during PCB replacement, or incorrectly inserted at the factory.

Symptoms

Unable to start
Immediate code C5

Diagnosis

1. PCB Inspection

Open the indoor unit.
Locate the 'Jumper Cap' on the wiring diagram and check its presence on the PCB.

How to reset fault code C5 on Gree?

Refit the original jumper cap. If lost, order a model-specific one (it has a precise resistance value).

When should you call an F-Gas engineer?

This code occurs during installation or maintenance of indoor units, particularly after a PCB replacement where the configuration jumper cap was omitted or incorrectly inserted. It prevents system start-up to avoid hardware configuration errors.

Affected models

High-Static Slim Duct
Universal Floor/Ceiling
Livo Plus
All Match Floor/Ceiling
All Match Mini Console

Field context

Technical source data

Code C5 indicates protection against jumper cap faults on the main PCB, classified as a hardware failure. The system detects missing insertion, incorrect positioning, a damaged component, or an abnormal detection circuit on the PCB (Extract 1, 2, 5, 8). Although some general manuals mention project address errors for central systems (Extract 4), the specific context for Split/U-Match and Floor/Ceiling models identifies jumper cap protection as the primary cause. The remote control remains functional but cannot execute start or stop commands related to this protection (Extract 1, 5, 8).

Sources: high static slim duct service manual b — high-static-slim-duct-service-manual-b.pdf (p. 32) · universal floor ceiling service manual b — universal-floor-ceiling-service-manual-b.pdf (p. 28) · livo plus service manual 30k 36k 230v b — livo-plus-service-manual-30k-36k-230v-b.pdf (p. 33)

Frequently asked questions

Why does the unit not start even though the remote control works?

Code C5 activates a hardware protection that blocks start and stop commands on the main PCB. Although the infrared receiver and remote control buttons are operational, the system refuses to execute cycle-related instructions due to a detected anomaly on the configuration jumper cap (Extract 1, 5, 8).

What are the precise technical causes of code C5?

Service manuals identify four main causes: 1) Complete absence of the jumper cap on the main PCB; 2) Incorrect insertion positioning of the jumper cap; 3) Physical deterioration of the jumper cap itself; 4) Anomaly in the detection circuit on the PCB (Extract 1, 2, 5, 8).

How can I visually identify the problem on the PCB?

Diagnosis relies on physical inspection of the main PCB. Check whether the jumper cap (plastic plug with wire) is properly inserted into its dedicated slot. A missing or incorrectly inserted jumper cap will immediately trigger code C5 and prevent any system operation (Extract 1, 5, 8).