Daikin FTKS20DVMW(L), Service Manual

Page: 136 / 228

SiENBE04-507A Troubleshooting
Service Diagnosis 127
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
„ 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).
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.4
Refer to P.144
Check No.6
Refer to P.146
Check No.11
Refer to P.148
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
Replace a defective
thermistor.
Replace the valve itself or
the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R2846)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check No. 6
Check the thermistors.
Check No. 11
Check the refrigerant
line.
Check No. 4
Check the electronic
expansion valve.
Refrigerant shortage
Four way valve malfunctioning
Water mixed
Stop valve defective
Discharge pipe thermistor
Outdoor unit heat exchanger thermistor
Outdoor temperature thermistor
Malfunctioning
Malfunctioning
Malfunctioning
Functioning
Functioning
Functioning
Caution