MXS Service Manual

Troubleshooting for Outdoor Unit SiUS121736EA
195 Service Diagnosis
7.12 Discharge Pipe Temperature Control
Error Code F3
Outdoor Unit LED
Display
A j 1 i 2 h 3 i 4 h 5 h
Method of Error
Detection
An error is determined with the temperature detected by the discharge pipe thermistor.
Error 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 is dropped below
B.
 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
Troubleshooting
Check No.01
Refer to P.209
Check No.12
Refer to P.212
Check No.14
Refer to P.213
AB
18 class 120°C (248°F) 95°C (203°F)
24/36 class 120°C (248°F) 107°C (224.6°F)
(R20417)
Caution
NG
OK
OK
OK
NG
NG
∗ Discharge pipe thermistor
∗ Outdoor heat exchanger thermistor
∗ Outdoor temperature thermistor
∗ Refrigerant shortage
∗ Four way valve
∗ Water mixed
∗ Stop valve
Check No. 12
Check the electronic
expansion valve.
Replace the defective
thermistor(s).
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB (main PCB).
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check No. 01
Check the thermistors.
Check No. 14
Check the refrigerant line.