In brief
Fault code P5 on Gree sapphire service manual 18mbh and 24mbh models a means: Fault code P5 indicates compressor phase overcurrent protection. The system detects an instantaneous current value above the set protection threshold, causing the system to stop to prevent damage. Most common cause: The main cause is excessive compressor current due to a system charge that is too high, incorrect three-phase cable connection (phase loss or reversed), loose contact, damaged current sampling circuit, or a faulty compressor. First action: Check if the system charge is excessive and if the compressor current is too high.. 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 (flexx eco service manual a p.51, flexx service manual ac bh p.43, flexx ultra r32 service manual a p.51), fault code P5 is triggered when the instantaneous compressor phase current exceeds the set protection threshold.
P5 • Gree • sapphire service manual 18mbh and 24mbh models a
Gree fault code P5: causes, diagnosis and solution
Fault code P5 indicates compressor phase overcurrent protection. The system detects an instantaneous current value above the set protection threshold, 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 P5 on Gree mean?
Fault code P5 indicates compressor phase overcurrent protection. The system detects an instantaneous current value above the set protection threshold, causing the system to stop to prevent damage.
The main cause is excessive compressor current due to a system charge that is too high, incorrect three-phase cable connection (phase loss or reversed), loose contact, damaged current sampling circuit, or a faulty compressor.
Symptômes
- Fault code P5 displayed on the ODU main PCB LED screen.
- Compressor stops during cooling and drying operations.
- Complete unit stop during heating operations.
- Indoor fan continues to run during cooling and drying.
- Indicator flashing (OFF 3S and flashes 15 times) on some models.
Diagnostic
1. Check charge and connections
- Check if the system charge is excessive and if the compressor current is too high.
- Inspect the three-phase cable connections of the compressor for phase loss or phase reversal.
- Ensure the compressor phase wires are not loose or making poor contact.
2. Inspect electronic components
- Examine the current sampling circuit components on the control PCB for damage.
- Check the condition of the AD sampling terminal of the AD converter on the control chip.
How to reset fault code P5 on Gree?
If the system charge is excessive, reduce the charge or increase the compressor capacity. Correct any poor connection, phase reversal, or loose contact on the three-phase cables. If the current sampling circuit or control chip is damaged, replace the control PCB. If the compressor is faulty, replace it.
When should you call an F-Gas engineer?
This code appears during cooling or dehumidification operation (compressor stopped, indoor fan active) or during heating (complete unit stop). It requires immediate verification of phase balancing, electrical connection condition, and operating current.
Affected models
- Sapphire 18MBH
- Sapphire 24MBH
- Flexx Eco
- Flexx Ultra R32
- Livo Plus 30k/36k
- All Match Floor Ceiling R32 9k/24k
Field context
This code appears during cooling or dehumidification operation (compressor stopped, indoor fan active) or during heating (complete unit stop). It requires immediate verification of phase balancing, electrical connection condition, and operating current.
Technical source data
Fault code P5 activates compressor phase overcurrent protection. The system detects an instantaneous current above the set threshold, causing the compressor to stop to prevent hardware damage. Identified causes include excessive system charge, incorrect three-phase connection (phase loss or reversed), loose contact on phase cables, or a failure of the current sampling circuit on the control PCB (damaged component or anomaly on the AD terminal of the chip). A faulty compressor itself is also a possible cause. (Sources: flexx eco service manual a p.51, flexx service manual ac bh p.43, flexx ultra r32 service manual a p.51)
Sources: flexx eco service manual a — flexx-eco-service-manual-a.pdf (p. 51) · flexx service manual ac bh — flexx-service-manual-ac-bh.pdf (p. 43) · flexx ultra r32 service manual a — flexx-ultra-r32-service-manual-a.pdf (p. 51)
Questions fréquentes
What is the unit behaviour when fault code P5 is displayed?
In cooling or dehumidification mode, the compressor stops while the indoor fan continues to run. In heating mode, the entire unit stops. This behaviour is designed to protect the compressor from overcurrents detected during operation.
What are the main causes of a phase overcurrent fault (P5)?
The main causes are a system charge that is too high leading to excessive current, incorrect three-phase cable connection (phase loss or phase reversal), loose contact on the phase wires, or a failure of the current sampling circuit on the control PCB (damaged component or anomaly on the AD terminal).
How do I diagnose and resolve a P5 code?
First check the system charge and reduce it if necessary. Inspect the three-phase connections to correct any phase loss or reversal. Ensure the contacts are tight. If the problem persists, test the current sampling circuit on the control PCB and replace it if needed, or replace the compressor if it is faulty.
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