In brief
Fault code H5 on Gree sapphire service manual 18mbh and 24mbh models a means: The H5 fault code indicates IPM module protection (Current Protection) on the compressor control board. This fault is triggered when the F0 pin of the IPM module remains at a low level, causing the system to stop to prevent damage. Most common cause: The main cause is a malfunction of the IPM module or its power supply (voltage < 13.5V), often due to poor connection of the compressor UVW phases, system overload, or a faulty current sensing circuit. First action: Check for missing or reversed phases on the compressor 3-phase cables.. 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 manual, the H5 fault code is triggered when the IPM module supply voltage drops below 13.5V (Extract 1, 2, 3).
H5 • Gree • sapphire service manual 18mbh and 24mbh models a
Gree H5 Fault Code: Causes, Diagnosis and Solution
The H5 fault code indicates IPM module protection (Current Protection) on the compressor control board. This fault is triggered when the F0 pin of the IPM module remains at a low level, causing the system to stop to prevent damage.
Source: Gree Documentation (service manual – according to product reference)
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What does fault code H5 on Gree mean?
The H5 fault code indicates IPM module protection (Current Protection) on the compressor control board. This fault is triggered when the F0 pin of the IPM module remains at a low level, causing the system to stop to prevent damage.
The main cause is a malfunction of the IPM module or its power supply (voltage < 13.5V), often due to poor connection of the compressor UVW phases, system overload, or a faulty current sensing circuit.
Symptômes
- The compressor stops during cooling and dehumidification operation.
- The indoor unit continues to operate (fan) in cooling mode.
- The entire unit stops in heating mode.
- H5 fault code displayed on the ODU main board LED screen.
- Indicator flashing (3 seconds, 5 flashes) on some models.
Diagnostic
1. Check Connections and Power Supply
- Check for missing or reversed phases on the compressor 3-phase cables.
- Measure the IPM module supply voltage (must be above 13.5V).
2. Inspect Control Circuit Components
- Check the integrity of the IPM module and the current sensing circuit on the control board.
- Check the 6-line PWM signal and the state of the IPM module F0 pin.
3. Compressor Electrical Test
- Measure the resistance between the windings of each phase (must be < 2 ohms and equal).
- Check the earth insulation of the phase windings (must be > 2 megohms).
How to reset fault code H5 on Gree?
If the UVW connections are correct and the compressor resistance and insulation measurements are normal, replace the compressor control board. If the compressor shows abnormal resistance values or an insulation fault, replace the compressor. In case of system overload, check the condition of the valves and pipework.
When should you call an F-Gas engineer?
This code appears during start-up or operation, causing the compressor to stop. In cooling mode, the indoor fan continues to run while the compressor stops. In heating mode, the entire unit stops completely. The LED indicator usually flashes
Affected models
- Sapphire 18MBH/24MBH
- Flexx Eco
- Flexx Ultra R32
- X-Pac R32
- Livo Plus 30k/36k
- Universal Floor Ceiling
Field context
This code appears during start-up or operation, causing the compressor to stop. In cooling mode, the indoor fan continues to run while the compressor stops. In heating mode, the entire unit stops completely. The LED indicator usually flashes
Technical source data
The H5 code signals IPM module protection (Current Protection) when the F0 pin of the IPM module is at a low level, indicating a malfunction of the module or control board. Causes include IPM module supply below 13.5V, a faulty current sensing circuit, abnormal PWM signals, or system overload due to blockage, high ambient temperature, or poor UVW phase connection. This fault stops the compressor to protect the system (Extract 1, 2, 3, 5).
Sources: flexx eco service manual a — flexx-eco-service-manual-a.pdf (p. 46) · flexx service manual ac bh — flexx-service-manual-ac-bh.pdf (p. 37) · flexx ultra r32 service manual a — flexx-ultra-r32-service-manual-a.pdf (p. 45)
Questions fréquentes
What is the unit's behaviour when the H5 code appears?
In cooling or dehumidification mode, the compressor stops while the indoor fan continues to run. In heating mode, the entire unit stops completely. The LED indicator usually flashes 5 times over 3 seconds to signal IPM module protection (Extract 7, 8).
How do I diagnose an incorrect IPM module power supply?
Check the IPM module supply voltage on the control board. If the voltage is below 13.5V, this can trigger the H5 code. Also ensure the compressor UVW phase connections are correct and not reversed, as a missing or reversed phase can also cause this fault (Extract 1, 2, 3).
What is the troubleshooting procedure if the UVW connections are correct?
If the UVW connections are valid, measure the resistance between the windings of each phase (should generally be less than 2 ohms and equal) and check the earth insulation (greater than 2 megohms). If these values are normal, replace the compressor control board. If the resistance measurements are abnormal, replace the compressor (Extract 5).
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