GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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Check the error code on nixie tube of ODU main control board. If P7 is displayed, it indicates
compressor drive board temperature sensor error
Possible reason：
■Compressor drive board is abnormal
Troubleshooting:
2.2.4.125 “P8” Compressor drive IPM high temperature protection
Error display:
ODU mainboard will display
Error judgment condition and method:
Check the error code on nixie tube of ODU main control board. If P8 is displayed, it indicates
compressor drive board IPM high temperature protection occurs
Possible reason：
■Screw of IPM module is not tightened;
■Thermal grease of IPM module hasn’t been spread or thermal grease is not spread evenly or
thermal grease is dry;
■Fan drive board is abnormal;
Troubleshooting:
2.2.4.126 “P9” Desynchronizing protection of inverter compressor.
Error display:
ODU mainboard will display
Error judgment condition and method:
Check the error code on nixie tube of ODU main control board. If P9 is displayed, it indicates
Desynchronizing protection of inverter compressor.
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