York YHKE09XEEAMH-RX Service Manual page 46

9.2.8 Over voltage or too low voltage protection diagnosis and solution(P1)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Check if the power supply is
normal.
Yes
Check if all the connections
and wires are good?
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?
Yes
Replace outdoor main PCB.
P1
An abnormal voltage rise or drop is detected by checking the
specified voltage detection circuit.
Power supply problems.
●
System leakage or block
●
PCB faulty
●
No
No
No
Disconnect the unit with power
supply and try to restart the unit
when power supply gets normal.
Correct the connections or replace
the wires.
Replace the IPM board if it is separate
with main PCB.
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