In brief

Fault code P1 on Gree sapphire service manual 18mbh and 24mbh models a means: Fault code P1 on Gree Sapphire 18MBH and 24MBH models indicates a compressor nominal frequency anomaly during the test state. This fault occurs specifically during nominal cooling or heating cycles. Most common cause: The provided technical manuals do not specify any possible cause for this fault code, classifying it as a test state indicator without a detailed fault diagnosis. First action: Confirm that the unit is undergoing a nominal cooling or heating test.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).

According to the proprietary insight, fault code P1 is classified as a test state indicator without a detailed fault diagnosis in the available service documents for this Gree range.

P1 • Gree • sapphire service manual 18mbh and 24mbh models a

Gree fault code P1: causes, diagnosis and solution

Fault code P1 on Gree Sapphire 18MBH and 24MBH models indicates a compressor nominal frequency anomaly during the test state. This fault occurs specifically during nominal cooling or heating cycles.

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

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What does fault code P1 on Gree mean?

Fault code P1 on Gree Sapphire 18MBH and 24MBH models indicates a compressor nominal frequency anomaly during the test state. This fault occurs specifically during nominal cooling or heating cycles.

The provided technical manuals do not specify any possible cause for this fault code, classifying it as a test state indicator without a detailed fault diagnosis.

Symptômes

Display of fault code P1 in Dual-8 Code mode.
Flashing of indicator lights (ON 0.5s / OFF 0.5s or ON 0.25s / OFF 0.25s depending on the reference manual).
Code activation only during nominal cooling or heating tests.
The absence of listed causes suggests the system is in test mode or the fault is not explicit in the documentation.

Diagnostic

1. Check the operating mode

Confirm that the unit is undergoing a nominal cooling or heating test.
Check the indicator flashing pattern (ON/OFF duration) to confirm code P1.

2. Consult the specific documentation

Refer to the Sapphire 18MBH/24MBH service manual for exact model specifications.
Check for any technical updates not included in the provided extracts regarding compressor frequency.

How to reset fault code P1 on Gree?

As the manual extracts provide no cause or repair procedure, no specific troubleshooting action can be recommended from the available data. It is essential to consult the full official manual or Gree technical support for calibration or compressor replacement procedures if necessary.

When should you call an F-Gas engineer?

This code appears during the nominal test phase of the system, whether in cooling or heating mode. The installer should check if the error triggers immediately at test start or after a period of operation. The absence of listed causes in the manuals indicates that this code is primarily a test state indicator.

Affected models

Gree Sapphire 18MBH and 24MBH
Gree Livo Plus 30k/36k 230V
Gree Livo Gen4 30MBH and 36MBH
Gree Vireo Plus Ultra 30MBH and 36MBH
Gree All Match Floor Ceiling R32 9k and 24k
Gree High Static Slim Duct

Field context

Technical source data

Fault code P1 (No. 24) on Gree units identifies a compressor nominal frequency anomaly detected specifically during the test state. This fault is not a classic mechanical fault indicator but a warning signal related to the validation of compressor parameters during nominal cycles. The technical manuals state that possible causes are not specified in the available service documents for this range, classifying the error as a test state without a detailed fault diagnosis. The display is via a Dual-8 code (P1) with a flashing sequence (often 0.25s ON / 0.25s OFF or 0.5s ON / 0.5s OFF depending on the manual) on the operation or cooling indicators. Detection occurs exclusively during nominal cooling or heating tests, suggesting a check of frequency stability.

Sources: high static slim duct service manual b — high-static-slim-duct-service-manual-b.pdf (p. 34) · universal floor ceiling service manual b — universal-floor-ceiling-service-manual-b.pdf (p. 30) · livo plus service manual 30k 36k 230v b — livo-plus-service-manual-30k-36k-230v-b.pdf (p. 35)

Questions fréquentes

Does code P1 indicate a compressor fault?

According to the manual extracts, code P1 signals a compressor nominal frequency anomaly detected during the test state. However, possible causes are not specified and the error is classified as a test state indicator rather than a detailed fault diagnosis. The fault occurs only during nominal cooling or heating cycles.

How is code P1 displayed on the unit?

The code is displayed as a Dual-8 code 'P1'. The display method varies slightly by model: on some manuals (e.g., Vireo Plus Ultra), the indicator flashes with an ON time of 0.25s and OFF time of 0.25s on the operation and cooling indicators. Other manuals (e.g., Universal Floor Ceiling) indicate a flash of 0.5s ON and 0.5s OFF. The display continues until the test is completed or the unit is reset.

What are the possible causes of code P1?

The technical manuals provided for Gree models (Sapphire, Livo, Vireo, All Match) do not specify any possible cause for this fault code. The document explicitly notes 'Possible Causes: Not specified' or 'Possible causes: None (test state)'. Therefore, no specific troubleshooting procedure can be recommended from these extracts. It is essential to refer to the full manual or contact Gree technical support.

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