Troubleshooting
SiBE12-933_A
190
Service Diagnosis
4.12 Discharge Pipe Temperature Control
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 the temperature being detected by the discharge pipe thermistor rises, the compressor stops.
The temperature at which the compressor halts varies according to the frequency.
(1) 110°C when the frequency is above 30Hz on ascending or above 25Hz on descending.
(2) 108°C when the frequency is below 30Hz on ascending or below 25Hz on descending.
The error is cleared when the temperature has dropped below 95°C.
If the compressor stops 6 times successively due to abnormal discharge pipe temperature,
the system is shut down.
The error counter is reset 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 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.213
Check No.06
Refer to P.215
Check No.11
Refer to P.218
(R7141)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Replace the defective
thermistor.
Check No. 06
Check the thermistors.
Functioning
Malfunctioning
Functioning
Functioning
Check No. 04
Check the electronic
expansion valve.
Check No. 11
Check the refrigerant
line.
Malfunctioning
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
Replace the valve itself or
the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.