Specifications

Troubleshooting SiUS12-928_A
123 Service Diagnosis
5.16 Discharge Pipe Temperature Control
Remote
Controller
Display
F3
Outdoor Unit LED
Display
A 5 1 4 2 1 3 4 4 1
Method of
Malfunction
Detection
Detected by the discharge pipe thermistor
Malfunction
Decision
Conditions
 If the temperature detected by the discharge pipe thermistor rises above , the compressor
stops.
 The error is cleared when the discharge pipe temperature is dropped below .
 If the error repeats 6 times, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
 Refrigerant shortage
 Defective four-way valve
 Defective discharge pipe thermistor
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
 Defective outdoor unit PCB
 Water mixed in refrigerant
 Defective electronic expansion valve
 Defective stop valve
Troubleshooting
Check No.04
Refer to P.150
Check No.06
Refer to P.152
Check No.11
Refer to P.155
120°C (248°F)
107°C (225°F)
(R7141)
Caution
Malfunctioning
 Discharge pipe thermistor
 Outdoor heat exchanger thermistor
 Outdoor temperature thermistor
 Refrigerant shortage
 Four way valve
 Water mixed
 Stop valve
Functioning
Functioning
Functioning
Malfunctioning
Malfunctioning
Check No. 06
Check the thermistors.
Check No. 11
Check the refrigerant
line.
Check No. 04
Check the electronic
expansion valve.
Replace the defective
thermistor.
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.