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38MGRBQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
High temperature protection of compressor top (IDU P2/ODU P0/PC 02)
ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
Troubleshooting
Check if the air flow system
of indoor and outdoor units
are obstructed
No
Turn of f the power supply and tur n
back on 10 minutes later
Yes
Check if the compressor top
temperature is higher than
194°F(90°C)
Yes
Check if the refrigerant
system is normal.
Yes
Replace the outdoor control PCB
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
P2/ODU P0/PC 02
If the sampling voltage is not 5V, the LED displays the failure.
Wiring mistake
Faulty overload protector
System leak or block
Faulty PCB
Clear up the air inlet and outlet or the heat
Yes
exchanger of indoor and outdoor units.
Check if all the connections,
No
especially the OLP connection
(Over Load Protector) sensor is good.
Measure the resistance
betwwen the two OLP ports.
No
Repair the refrigerant
system
Yes
No
Is it zero?
Yes
Replace the outdoor control PCB.
69
No
Correct the connection.
Replace the OLP
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