Midea M4OC-36HRFN1-M - Condenser High Temperature Protection (P5) Diagnosis

9.4.2.13 P5(High temperature protection of condenser) error diagnosis and solution.
Error Code
P5
Malfunction decision
conditions
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
Supposed causes
● The condenser temperature sensor faulty
● Heat exchanger dirty
● System block
Trouble shooting:
High temperature protection of
condenser
Check whether the
condenser temperature is
more than 65°C
Yes
Judge 1: Check whether the
outdoor ambient
temperature is higher than
50℃
No
Judge 3: The refrigerant
pipe is blocked
Let the refrigerant out, then use the high
pressure nitrogen or refrigerant to blow pipe,
vacuumize and charge the refrigerant again
Yes
Judge 2: Check whether the
heat exchanger is dirty
No
Clean the heat exchanger
Yes
Replace outdoor main boardYes
Check whether the
resistance of condenser
temp. sensor is correct
refer to the Appendix 1
Replace the temperature sensor
Stop the unit
Yes
No
No