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38MGRBQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
P1/PC 30 (High pressure protection) diagnosis and solution
ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
Troubleshooting
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
P1/PC 30
If the sampling voltage is not 5V, the LED displays the failure.
Wiring mistake
Faulty over load protector
System block
Faulty Outdoor PCB
High pressure protection
Is the wiring between
the high pressure switch and
the main control board is
connected well
Yes
Is the high
pressure protector
broken?
Method:
Method:
Disconnect the plug.
.
the
Measure the resistance of
high pressure protector, if
, if
the protector is normal the
value is 0,
,
Yes
Check whether the outdoor
ambient temperature is
higher than 50
No
Check if the outdoor unit
ventilation is good
Yes
Check if the outdoor fan runs
properly
Yes
Check whether the heat
exchanger is dirty
No
Replace outdoor main
board
No
Check whether the refrigerant
system is ok
No
Connect it well
No
Replace high pressure protector
Yes
Stop the unit
Ensure the outdoor unit
NO
is well ventilated
Refer to the Fan Speed is Out of
Control solution. Determine
No
the cause and solve.
Yes
Clean the heat exchanger
60
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