III - 18
Service Procedures
3
SM830063
(13) Symptoms: LCD on the remote controller displays “CHECK P03”.
(Alarm for unusual PC comp, discharge temp.)
The remote controller LCD displays “CHECK P17”.
(Alarm for unusual PC comp, discharge temp.)
1. Troubleshooting
(14) Symptom: LCD on the remote controller displays “CHECK P04”. (High-pressure switch operation)
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 operation
(Both cooling and heating)
• Electronic refrigerant control valve
defect
(indoor unit)
(Cooling)
• Outdoor unit, heat exchanger dirty,
clogged
• Outdoor unit air short
• Outdoor fan stopped
• Refrigerant over-charged
(Heating)
• Outdoor unit air short
• Indoor unit, heat exchanger dirty,
clogged
• Large pipe side service valve
closed
• Indoor fan stop
• Air filter clog
0343_M_I
Start
Yes
Unusual discharge gas temperature
• Gas shortage
• Clogged refrigerant circuit
• Electronic refrigerant control
valve defect (indoor unit)
• (Over-charged refrigerant)