Troubleshooting SiUS041111
96 Service Diagnosis
4.14 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 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 four-way valve
Water mixed in refrigerant
Defective stop valve
Defective outdoor unit PCB
Stop temperatures
AB
°C °F °C °F
(1) above 50 Hz (rising), above 45 Hz (dropping) 110 230 97 206.6
(2) 39 ~ 50 Hz (rising), 34 ~ 45 Hz (dropping) 105 221 92 197.6
(3) below 39 Hz (rising), below 34 Hz (dropping) 100 212 87 188.6
Stop temperatures
AB
°C °F °C °F
(1) above 50 Hz (rising), above 45 Hz (dropping) 118 244.4 85 185
(2) 35 ~ 50 Hz (rising), 30 ~ 45 Hz (dropping) 110 230 77 170.6
(3) below 35 Hz (rising), below 30 Hz (dropping) 93 199.4 60 140
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