MCAC-UTSM-2008-05 Troubleshooting
Outdoor Units 67
10. P5 malfunction
.
LED indicates P5
Condenser high temperature protection
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(more than 43 )℃
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
Drop refrigerant, then use the high pressure
nitrogen or refrigerant to blow pipe,
vacuumize and add the refrigerant again
Yes
Stop the unit
No
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