Gree GMV5E Series Service Manual page 229

GREE
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.
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
225