Midea MCH2U-18PHH2 Service Manual page 88

8.4.2.12 P5 (High temperature protection of condenser) diagnosis and solution.
Error Code
Malfunction conditions
Potential causes
Trouble shooting:
P5
When outdoor pipe temperature is more than 65°C, the unit will
stop, and unit runs again when outdoor pipe temperature is less
than 52°C
● Faulty condenser temperature sensor
● Heat exchanger dirty
● System block
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