GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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3.4.30 ―P8‖ Driver Module High Temperature Protection
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display P8
Error judgment condition and method:
If IPM module temperature or PFC module temperature exceeds the set protection value, then it can be
judged that driver module temperature is too high and system will shut down for protection.
Possible reason:
■Thermal grease is not applied or not evenly applied to the module, or there is other substance on the back of the
module.
■The module securing screws are not tightened up.
■Drive board temperature sampling circuit element is damaged or drive chip temperature sampling AD terminal is
abnormal.
Troubleshooting：
P8 Driver module high
temperature protection
Thermal grease is not applied or not evenly
applied to the module？ Is there foreign matter
on the back of the module?
The module securing screws
are not tightened ?
Tighten the screws
Replace the
drive board
Apply the t hermal g rease
evenly. Remove the f o reign
matter.
YES
YES
NO
NO
3.4.31 ―PA‖ AC Current Protection
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display PA
Error judgment condition and method:
If input current value exceeds the set protection value, then it can be judged that AC current protection
occurs and system will shut down for protection.
Possible reason:
■System is heavy-loaded and compressor current is too large.
■Grid voltage is abnormal.
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