In brief

Fault code P3 on Gree sapphire service manual 18mbh and 24mbh models a means: Fault code P3 (No. 26) indicates an intermediate frequency anomaly of the compressor detected during the test state. This message is displayed specifically when the system is in intermediate cooling or heating mode. Most common cause: The technical manual does not specify any possible cause for this fault code. It is noted that the malfunction occurs only during the intermediate operation test. First action: Confirm that the system is in intermediate cooling or heating mode.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).

According to the Gree service manuals for Sapphire, Livo Plus, All Match, and Vireo Plus Ultra models, no specific mechanical or electrical cause is listed for fault code P3, indicating the malfunction is intrinsically linked to the compressor frequency test process.

P3 • Gree • sapphire service manual 18mbh and 24mbh models a

Gree fault code P3: causes, diagnosis and solution

Fault code P3 (No. 26) indicates an intermediate frequency anomaly of the compressor detected during the test state. This message is displayed specifically when the system is in intermediate cooling or heating mode.

Source: Gree documentation (service manual – according to product reference) · Updated on 8 June 2026

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What does fault code P3 on Gree mean?

The technical manual does not specify any possible cause for this fault code. It is noted that the malfunction occurs only during the intermediate operation test.

Symptômes

Display of fault code P3 on the indoor unit.
Display of fault code P3 on the outdoor unit.
Flashing indicators (ON 0.25s and OFF 0.25s) on both indoor and outdoor units.
System in intermediate cooling or heating mode.
No causes listed in the documentation.

Diagnostic

1. Check the operating mode

Confirm that the system is in intermediate cooling or heating mode.
Observe the behaviour of the flashing indicators (ON 0.25s and OFF 0.25s).

2. Check the units

Verify the display of code P3 on the indoor unit.
Verify the display of code P3 on the outdoor unit.

3. Consult the causes

Search for specific causes in the technical manual.
Note the absence of possible causes provided for this code.

How to reset fault code P3 on Gree?

The manual provides no resolution procedure or possible causes for this code. It is recommended to contact technical support or the manufacturer for specific instructions, as the malfunction is related to a compressor intermediate frequency test.

When should you call an F-Gas engineer?

This code occurs exclusively during the intermediate operation test phase (middle cooling/heating test) of the system. It should not be interpreted as a fault under normal load conditions. The installer must verify that the system is indeed performing this specific test cycle before proceeding.

Affected models

Gree Sapphire 18MBH and 24MBH
Gree Livo Plus 30k and 36k
Gree All Match Floor Ceiling R32 9k and 24k
Gree Livo Gen4 30MBH and 36MBH
Gree Vireo Plus Ultra 30MBH and 36MBH

Field context

Technical source data

Fault code P3 (No. 26) signals an intermediate frequency anomaly of the compressor detected specifically during the test state. This fault appears only during intermediate cooling or intermediate heating test cycles, not in normal operation. The technical manuals list no specific mechanical or electrical cause for this trigger, indicating that the malfunction is intrinsically linked to the compressor frequency test process. The display is typically via flashing (ON 0.25s / OFF 0.25s) on indoor and outdoor units. In the absence of identified causes in the documentation, no standard repair procedure is provided, requiring direct intervention with technical support or the manufacturer for advanced diagnostics on compressor frequency control (Sources: Service manuals for Sapphire, Livo Plus, All Match, Vireo Plus Ultra).

Sources: high static slim duct service manual b — high-static-slim-duct-service-manual-b.pdf (p. 35) · universal floor ceiling service manual b — universal-floor-ceiling-service-manual-b.pdf (p. 31) · livo plus service manual 30k 36k 230v b — livo-plus-service-manual-30k-36k-230v-b.pdf (p. 36)

Questions fréquentes

Why does code P3 appear only during the test and not in normal operation?

Code P3 (No. 26) indicates an intermediate frequency anomaly of the compressor detected specifically during the test state. The technical manuals state that this message is displayed only during the intermediate cooling or intermediate heating test. No other cause is mentioned, suggesting that the problem is related to the test process itself rather than a component failure.

What are the possible causes identified for code P3?

According to extracts from the technical manuals (Sapphire, Livo Plus, All Match, etc.), no possible cause is specified for this fault code. The malfunction is described as being related to the detection of the compressor intermediate frequency during the test state. In the absence of listed causes, it is recommended to contact technical support or the manufacturer for specific instructions.

How is code P3 displayed on the units?

Code P3 is displayed with a specific flashing pattern: the indicator remains on for 0.25 seconds and off for 0.25 seconds (ON 0.25s and OFF 0.25s). This display is visible on both the indoor unit and the outdoor unit, as indicated in the manuals for the Livo Plus and Vireo Plus Ultra models.

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