Midea Mono 3D - Page 56

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9.3.8 Over voltage or too low voltage protection diagnosis and solution(P1)
Error Code
P1
Malfunction decision
conditions
An abnormal voltage rise or drop is detected by checking the
specified voltage detection circuit.
Supposed causes
● Power supply problems.
● System leakage or block
● PCB faulty
Trouble shooting:
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 main PCB.
Yes
No
Replace the IPM board if it is
separate with main PCB.
Remark:
Measure the DC voltage
between P and N port. The
normal value should be
around 310V.
P
N