Troubleshooting MLCAC-UTSM-2010-10
92 Outdoor Units
12. P5 malfunction
When condenser high temp. is more than 65°C, the unit will stop, and unit runs again when outdoor pipe
temp. less than 52°C.
P5 display
High temperature protection of condenser
Check whether the condenser temperature is more than 65°C
No
Check whether the resistance of condenser temp.
sensor is correct refer to the Annex 1
Yes
Replace outdoor main board
No
Replace the temperature sensor
Yes
Judge1: The outdoor temp. is too high
Replace outdoor main board
No
Judge 2: Check whether the heat exchanger is dirty
No
Judge 3: The refrigerant pipe is blocked
Clean the heat exchanger
Yes
Yes
Let the refrigerant out, then use the high pressure
nitrogen or refrigerant to blow pipe, vacuumize and
charge the refrigerant again
Yes
Stop the unit
No
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