Discharge Pipe Temperature Control - Daikin G-Series Service Manual

Troubleshooting

4.12 Discharge Pipe Temperature Control

F3
Remote
Controller
Display
Method of The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the
Malfunction temperature being detected by the discharge pipe thermistor.
Detection
Malfunction 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.
Decision
(1) 110°C when the frequency is above 30Hz on ascending or above 25Hz on descending.
Conditions
(2) 108°C when the frequency is below 30Hz on ascending or below 25Hz on descending.
Supposed
Causes
Troubleshooting
Check No.04
Refer to P.213
Check No.06
Refer to P.215
Check No.11
Refer to P.218
190
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).
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
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check No. 06
Check the thermistors.
Functioning
Check No. 04
Check the electronic
expansion valve.
Functioning
Check No. 11
Check the refrigerant
line.
Functioning
Malfunctioning
Discharge pipe thermistor
Outdoor unit heat exchanger thermistor
Outdoor temperature thermistor
Malfunctioning
Malfunctioning
Refrigerant shortage
Four way valve malfunctioning
Water mixed
Stop valve defective
SiBE12-933_A
Replace the defective
thermistor.
Replace the valve itself or
the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R7141)
Service Diagnosis