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Section
IV - 15
SM830082
4. Service procedures
11) Symptoms: LCD on the remote controller displays “CHECK P03”.
(Alarm for unusual discharge temp. of compressor)
12) Symptom: LCD on the remote controller displays “CHECK P04”. (High-pressure switch
activation warning)
0343_M_I
Start
Unusual discharge gas temperature
• Refrigerant shortage
• Clogged refrigerant circuit
• Electronic refrigerant control
valve defect (indoor unit)
No Yes
No
Yes
0344_M_I
Start
Are there connection defects in
the wiring?
High-pressure switch defect
Repair the wiring.
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
• 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