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Specifications subject to change without notice. 38MGR-04SM
DIAGNOSIS AND SOLUTION (CONT)
Current protection of compressor error (P3)
Troubleshooting
ERROR CODE
P3
MALFUNCTION DECISION
CONDITIONS
If the outdoor current exceeds the current limit value, the LED displays the failure.
SUPPOSED CAUSES
• Wiring mistake
• Over load protector faulty
• System block
• Outdoor PCB faulty
,
No
Yes
No
Yes
No
Yes
No
Yes
Yes
No
Yes
No
Current Compressor Protection
Judge 1:
Check if the power
supply wire input current is more
than 12.5A (18K) For 24K it is 17.
For 30K, it is 18.5. For 36K, it is 23A.
Replace the outdoor main board.
Check if the refrigerant system
is working as designed.
Judge 2:
Check if the
outdoor ambient temperature
is higher than 122° F.
Stop the unit.
Judge 3:
Check whether the
outdoor unit’s ventilation is poor.
Resolve the ventilation issue.
Judge 4:
Check if the
heat exchanger is dirty.
Clean the heat exchanger.
Judge 5:
The refrigerant
pipe is blocked.
Let the refrigerant out, and then use the high
pressure nitrogen or refrigerant to blow the
pipe, vacuum, and charge the refrigerant again.
Replace the outdoor main board
and check whether the system
can run normally.
Replace the electric control box.
Problem solved.
Yes