Midea M5OF-48HFN1-M - High Temperature Protection of Compressor Top (IDU P2;ODU P0)

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7.4.2.14. High temperature protection of compressor top(IDU P2/ODU P0)
Malfunction decision
conditions
If the sampling voltage is not 5V, the LED will display the failure.
Supposed causes
● Faulty overload protector
● Wiring mistake
● System leakage or block
● Faulty PCB
Check if the air flow system
of indoor and outdoor units
are obstructed?
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Yes
No
Yes
Yes
Turn off the power supply and turn
it on 10 minutes later.
Check if the temperature
of compressor Top
Is more than 90℃？
No
Check if the refrigerant
system
is normal?
Repair the refrigerant
system .
Replace the outdoor control PCB.
Yes
Check if all the connection, especially
the connection of OLP (Over Load
Protector) sensor is good.
Correct the connection.No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP.No
Replace the outdoor control PCB.
Yes
No