Vivax ACP-12CT32AEI/I Service Manual page 51

Troubleshooting
8. P3 malfunction
Judge 1: Check whether the input current of the power supply wire
is more than 16A
Check whether the refrigerant system is ok
Judge 2: Check whether the outdoor ambient temperature is too high
Judge 3: Check whether the outdoor unit is bad ventilation
Judge 4: Check whether the heat exchanger is dirty
Judge 5: The refrigerant pipe is blocked
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LED indicates P3
Outdoor unit current protection
Yes
No
No
No
No
Replace outdoor main board
Yes
Yes
Yes
Drop refrigerant, then use the high pressure
nitrogen or refrigerant to blow pipe,
vacuumize and add the refrigerant again
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MCAC-UTSM-2008-04
Yes
Stop the unit
Make the outdoor unit ventilate well
Clean the heat exchanger
Outdoor Units