GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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2.2.4.83 “H9” 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 H9 is displayed, it indicates
Desynchronizing protection of inverter compressor
Possible reason：
■Poor contact of fan UVW wire
■Fan is broken
■Fan blade is blocked (Fan blade is blocked and motor shaft is rusty)
■Fan drive board is abnormal
Troubleshooting:
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