1. Compressor inverter module address is set through dial switch S7 on the inverter module. The compressor inverter module A/B location refers to the
L4 protection
ODU ventilation is not good
Remove barriers from heat
exchanger and air outlet of ODU
ODU stop valves are closed Open the ODU stop valves
Reconnect the cables based on
wiring diagram
The resistance between 3 phases of
compressor is over 5Ω
Replace the compressor
The insulation resistance of
compressor is less than 100Ω
Replace the compressor inverter
board, restart the unit and the error is
solved
Refer to P1 or P3 troubleshooting
No
No
Yes
Yes
Disconnect
the power
supply
Compressor wiring is not properly
Inverter module address setting
1
and
discharge temperature sensor wiring is
not properly
Reset the inverter module address
and reconnect the discharge
temperature sensor cables
Yes
Normal
Yes
Yes
Yes
Yes
No
No
No
No
No
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