Troubleshooting
SiUS091133
121
Service Diagnosis
4.17 Discharge Pipe Temperature Control
Remote
Controller
Display
F3
Method of
Malfunction
Detection
An error is determined with the temperature detected by the discharge pipe thermistor.
Malfunction
Decision
Conditions
If the temperature detected by the discharge pipe thermistor rises above A, the compressor
stops.
The error is cleared when the discharge pipe temperature has dropped below B.
<09/12 class>
<15/18/24/30/36 class>
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Defective discharge pipe thermistor
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Defective electronic expansion valve or coil
Refrigerant shortage
Defective fourway valve
Water mixed in refrigerant
Defective stop valve
Defective outdoor unit PCB
A
B
(1) above 45 Hz (rising), above 40 Hz (dropping)
110°C (230°F)
97°C (206.6°F)
(2) 30 ~ 45 Hz (rising), 25 ~ 40 Hz (dropping)
105°C (221°F)
92°C (197.6°F)
(3) below 30 Hz (rising), below 25 Hz (dropping)
99°C (210.2°F)
86°C (186.8°F)
A
B
15/18 class
110°C (230°F)
95°C (203°F)
24/30/36 class
120°C (248°F)
107°C (224.6°F)
