Check if the power supply is
normal.
Check if all the connections
and wires are good?
Disconnect the unit with power
supply and try to restart the unit
when power supply gets normal.
No
Yes
No
Correct the connections or replace
the wires.
Yes
Power on and when the unit is in
standby, check if the voltage
between P and N is around DC
310V or 340V or 380V? For different
kinds of units, the voltage differs.
Consult with technical engineer to
get definite value. Then start up the
unit, measure the voltage between
P and N. Is it in 220V~400V?
Replace outdoor mainl PCB.
Yes
No
Replace the IPM board if it is separate
with main PCB.
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