Perfectaire 1PAMSH18-MZO2-16, Service Manual

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8.4.2.8 P0(Temperature protection of compressor top) error diagnosis and solution. (Only for M3OD-
27HRDN1-M)
Error Code P0
Malfunction decision
conditions
If the sampling voltage is not 5V, the LED will display the failure.
Supposed causes
●
Wiring mistake
●
Over load protector faulty
●
System block
●
Outdoor PCB faulty
Trouble shooting:
Check the air flow system
of indoor and outdoor units
Check the air flow system
of indoor and outdoor units
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Yes
No
Yes
Yes
Power off, then restart the unit 10
minutes later
Power off, then restart the unit 10
minutes later
Check whether the
temperature of
compressor top is more
than 100
℃
Check whether the
temperature of
compressor top is more
than 100
℃
No
Check the refrigerant
volume charge
Check the refrigerant
volume charge
Recharge the correct
refrigerant volume.
Recharge the correct
refrigerant volume.
Refrigerant system is blocked, such
as capillary or welded point of pipes.
Refrigerant system is blocked, such
as capillary or welded point of pipes.
Yes
Check wiring connection
of the overload protector
Check wiring connection
of the overload protector
Correct the connection.
Correct the connection. No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP.
Replace the OLP. No
Replace the outdoor main PCB.
Replace the outdoor main PCB. Yes
No
Temperature protection of compressor
top
Temperature protection of compressor
top