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4. SERVICE PROCEDURES
11) Symptom: LCD on the remote controller displays "CHECK P02". (Compressor /
outdoor fan protection thermostat operation warning / power supply
voltage abnormality)
Start
Is the power supply to the outdoor
unit normal?
(Voltage / defective phase?)
Is the fuse on the outdoor unit
PCB blown (F1 and F2)?
Is the high voltage switch
(63 PH) off?
Is there 220-240 V AC between
CN19-9 and CN19-1 on the
outdoor unit PCB?
Is the compressor protection
thermostat (49C) off except 48 type?
• No refrigerant
• High load
• 4-way valve defect
• Clogged refrigerant circuit
• Electronic refrigerant control valve
defect (indoor unit)
No
Yes
Yes
No
Yes
No
Yes
No
No
Yes
Is there connector contact defect?
Replace the outdoor unit PCB.
Check the power breaker etc.
and repair.
Replace the fuse.
Replace the outdoor unit PCB.
Replace the outdoor unit PCB.
Is the outdoor fan wire winding
protection thermostat (49FO) off?
Replace the outdoor fan.
Yes
No
75
–
–
No
Yes
Correct the connection
0342_M_I
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