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4. SERVICE PROCEDURES
11) Symptoms: LCD on the remote controller displays "CHECK P03".
Unusual discharge gas temperature
• Refrigerant shortage
• Clogged refrigerant circuit
• Electronic refrigerant control
valve defect (indoor unit)
12) Symptom: LCD on the remote controller displays "CHECK P04". (High-pressure
Start
The system does not operate again.
High-pressure switch activation
(Both cooling and heating)
• Electronic refrigerant control valve
defect
• Refrigerant over-charged
(Cooling)
• Outdoor unit, heat exchanger dirty,
clogged
• Outdoor unit air short
4
• Outdoor fan stopped
(Heating)
• Outdoor unit air short
• Indoor unit, heat exchanger dirty,
clogged
• Large pipe side service valve
closed
• Indoor fan stop
• Air filter clogged
(Alarm for unusual discharge temp. of compressor)
Start
0343_M_I
switch activation warning)
No
Are there connection defects in
the wiring?
Yes
No
High-pressure switch defect
77
–
–
Yes
Repair the wiring.
0344_M_I
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