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38MGRBQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
P3/PC 08 (Current overload protection)/ PC 44(Outdoor unit zero speed protection)/PC 46(Compressor speed is out
of control)/PC 49 (Compressor overcurrent failure) diagnosis and solution
ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
Troubleshooting
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
P3/PC 08/PC 44/PC 46/PC 49
If the outdoor current exceeds the current limit value, the LED displays the failure.
Wiring mistake
Faulty overload protector
System block
Faulty Outdoor PCB
Current protection of compressor
Judge 1: Check if the input current
of the power supply wire is greater
than 15A (18K). For 27K and High Heat
18K, it is 18.5A. For 36K and High Heat
27K, it is 22.5A. For 48K and
High Heat 36K, it is 28A.
Yes
Check whether the
refrigerant system
is ok
Judge 2: Check whether the
outdoor ambient temperature
is higher than 50
No
Judge 3: Check whether the
outdoor unit has poor ventilat i on
No
Judge 4: Check whether the
heat exchanger is dirty
No
Judge 5: The refrigerant pipe is
blocked
No
Replace outdoor main
board, and check whether the
system can run normally
No
Replace the electric control box
No
Replace outdoor main board
Yes
Stop the unit
Yes
Ensure the outdoor unit ventilates well
Yes
Clean the heat exchanger
Evacuate the refrigerant, then use the high
Yes
pressure nitrogen or refrigerant to blow pipe,
vacuumize and charge the refrigerant again
Yes
Yes
Problem solved
64
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