In brief
Fault code H7 on Gree livo gen4 service manual 9mbh 24mbh a means: Fault code H7 indicates compressor out-of-step protection, triggered when the rotor position cannot be detected or the actual speed differs too much from the set speed. This fault stops the compressor during operation to protect the system. Most common cause: The main cause is a loss of compressor synchronisation due to incorrect phase connection (missing or reversed), poor connection, system blockage, lack of refrigerant or oil, or failure of control board components (IPM module, current sampling circuit). First action: Inspect the three-phase compressor connections for any missing or reversed phases.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).
According to Gree service documentation, code H7 is specifically related to compressor out-of-step protection and not to temperature sensor faults, except for the GMV6 Ultra Heat Mini Heat Pump models.
H7 • Gree • livo gen4 service manual 9mbh 24mbh a
Gree fault code H7: causes, diagnosis and solution
Fault code H7 indicates compressor out-of-step protection, triggered when the rotor position cannot be detected or the actual speed differs too much from the set speed. This fault stops the compressor during operation to protect the system.
Source: Gree documentation (service manual – according to product reference)
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What does fault code H7 on Gree mean?
Fault code H7 indicates compressor out-of-step protection, triggered when the rotor position cannot be detected or the actual speed differs too much from the set speed. This fault stops the compressor during operation to protect the system.
The main cause is a loss of compressor synchronisation due to incorrect phase connection (missing or reversed), poor connection, system blockage, lack of refrigerant or oil, or failure of control board components (IPM module, current sampling circuit).
Symptômes
- The compressor stops during operation.
- In cooling and dehumidification modes, the indoor fan continues to run while the compressor is stopped.
- In heating mode, the entire unit stops.
- Fault code H7 appears on the system display.
- The system cannot detect the rotor position.
Diagnostic
1. Check electrical connections
- Inspect the three-phase compressor connections for any missing or reversed phases.
- Check the condition of the compressor phase wire connections to ensure they are not faulty.
2. Analyse the system and control board
- Check if the system is blocked or if there is a lack of refrigerant or oil in the compressor.
- Inspect the control board for any damage to the IPM module or elements of the compressor current sampling circuit.
How to reset fault code H7 on Gree?
Correct any incorrect compressor phase connection or repair faulty connections. If the system is blocked, restore refrigerant and oil flow. If the control board is damaged (IPM module or sampling circuit), replace the faulty components. If the compressor itself is damaged, it must be replaced.
When should you call an F-Gas engineer?
This code appears during compressor operation, whether in cooling or heating mode. It indicates a critical loss of synchronisation between the control signal and the physical rotation of the rotor, requiring immediate checking of electrical connections and the condition of the compressor.
Affected models
- Flexx
- Flexx Eco
- High Static Slim Duct
- Universal Floor Ceiling
- Livo Plus
- GMV6 Ultra Heat Mini Heat Pump
Field context
This code appears during compressor operation, whether in cooling or heating mode. It indicates a critical loss of synchronisation between the control signal and the physical rotation of the rotor, requiring immediate checking of electrical connections and the condition of the compressor.
Technical source data
Code H7 activates compressor out-of-step protection (Driver Out-of-Step Protection). The fault triggers when the rotor position cannot be detected or the actual speed differs excessively from the set speed, stopping the compressor to prevent mechanical damage. Identified causes include incorrect three-phase connection (missing or reversed phase), poor wire connection, system blockage, lack of refrigerant or oil, and hardware failures on the control board (damaged IPM module or faulty current sampling circuit). The unit stops completely in heating mode, while in cooling mode the compressor stops but the indoor fan continues to run.
Sources: flexx service manual ac bh — flexx-service-manual-ac-bh.pdf (p. 39) · flexx eco service manual a — flexx-eco-service-manual-a.pdf (p. 53) · high static slim duct service manual b — high-static-slim-duct-service-manual-b.pdf (p. 36)
Questions fréquentes
Why does the compressor stop in cooling mode but the indoor fan continues to run?
In cooling or dehumidification mode, code H7 stops the compressor to protect the motor, while the indoor fan continues to run to circulate air. In heating mode, the protection is stricter and causes the entire unit to stop. This behaviour is a standard safety measure during a loss of rotor synchronisation.
What are the first things to check to resolve a code H7?
First, check the three-phase compressor connections for any missing, reversed, or poor connections. Then, ensure the system is not blocked and there is sufficient refrigerant and oil. If these are okay, inspect the control board for damage to the IPM module or current sampling circuits.
Can code H7 be caused by a temperature sensor problem?
No, according to the manuals, code H7 is specifically related to compressor out-of-step protection (rotor rotation). Code H7 mentioning a temperature sensor only applies to the GMV6 Ultra Heat Mini Heat Pump models and does not apply to other ranges listed for this synchronisation fault.
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