Specifications

Troubleshooting SiBE06-708
108 Service Diagnosis
4.14 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
25/35 class

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 °C, the
compressor will stop. (The error is cleared when the temperature has dropped below
°C.)

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).
50 class

If a stop takes place 6 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 °C, the
compressor will stop. (The error is cleared when the temperature has dropped below °C.)

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 temperature thermistor defective)

Outdoor unit PCB defective

Water mixed in the local piping

Electronic expansion valve defective

Stop valve defective
Stop temperatures
(1) above 45Hz (rising), above 40Hz (dropping) 110 97
(2) 30~45Hz (rising), 25~40Hz (dropping) 105 92
(3) below 30Hz (rising), below 25Hz (dropping) 99 86
50 class
110
95