Troubleshooting MLCAC-UTSM-2010-10
90 Outdoor Units
10. P3 malfunction
P3 display
Current protection of compressor
Judge 1: Check whether the input current of the power supply wire is more
than 20A (For 36K & 48K with 1 phase, it is 30A)
Check whether the refrigerant system is ok
Yes
Judge 2: Check whether the outdoor ambient temperature is too high
Yes
Stop the unit
Replace outdoor main board
No
No
Judge 3: Check whether the outdoor unit is bad ventilation
Yes
Make the outdoor unit ventilate well
No
Judge 4: Check whether the heat exchanger is dirty
Yes
Clean the heat exchanger
No
Judge 5: The refrigerant pipe is blocked
Yes
Let the refrigerant out, then use the high pressure
nitrogen or refrigerant to blow pipe, vacuumize and
charge the refrigerant again
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