SiUS04-702 Troubleshooting
Service Diagnosis 143
4.12 Discharge Pipe Temperature Control
4.12.1 09/12 Class
Remote
Controller
Display
F3
Method of
Malfunction
Detection
The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the
temperature being detected by the discharge pipe thermistor.
Malfunction
Decision
Conditions
If a stop takes place 4 times successively due to abnormal discharge pipe temperature, the
system will be shut down.
If the temperature being detected by the discharge pipe thermistor rises above °F, the
compressor will stop. (The error is cleared when the temperature has dropped below °F.)
The error counter will reset itself if this or any other error does not occur during the following 60-
minute compressor running time (total time).
Supposed
Causes
Refrigerant shortage
Four way valve malfunctioning
Discharge pipe thermistor defective
(heat exchanger or outdoor air temperature thermistor defective)
Outdoor unit PCB defective
Water mixed in the local piping
Electronic expansion valve defective
Stop valve defective
Troubleshooting
Check No.04
Refer to P.170
Check No.06
Refer to P.173
Check No.11
Refer to P.176
Stop temperatures
(1) above 45Hz (rising), above 40Hz (dropping) 230 207
(2) 30~45Hz (rising), 25~40Hz (dropping) 221 198
(3) below 30Hz (rising), below 25Hz (dropping) 210 187
Replace a defective
thermistor.
Replace the valve itself or
the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R4700)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check No. 06
Check the thermistors.
Malfunctioning
z Discharge pipe thermistor
z Outdoor unit heat exchanger thermistor
z Outdoor temperature thermistor
z Refrigerant shortage
z Four way valve malfunctioning
z Water mixed
z Stop valve defective
Malfunctioning
Functioning
Functioning
Functioning
Check No. 11
Check the refrigerant line.
Malfunctioning
Check No. 04
Check the electronic expansion
valve.
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