Discharge Pipe Temperature Control - Daikin F-Series Service Manual

Troubleshooting

4.12 Discharge Pipe Temperature Control

F3
Remote Control
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 will
Decision stop. 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.
Conditions
(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 error counter will reset itself if this or any other error does not occur during the following
Supposed " Refrigerant shortage
Causes " Four way valve malfunctioning
" Discharge pipe 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.146
Check No.06
Refer to P.149
Check No.11
Refer to P.152
124
the system will be shut down.
60-minute compressor running time (total time).
(heat exchanger or outdoor temperature thermistor 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
SiEN12-710A
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