Discharge Pipe Temperature Control - Daikin FTXS30HVJU Service Manual

Troubleshooting

4.14 Discharge Pipe Temperature Control

F3
Remote
Controller
Display
Method of
The discharge pipe temperature control (stop, frequency dropping, etc.) is checked with the
Malfunction temperature being detected by the discharge pipe thermistor.
Detection
 If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the
Malfunction
Decision
 If the temperature being detected by the discharge pipe thermistor rises above
Conditions
 The error counter will reset itself if this or any other error does not occur during the following 60-
 Refrigerant shortage
Supposed
 Four-way valve malfunctioning
Causes
 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.106
Check No.06
Refer to P.108
Check No.11
Refer to P.110
88
system will be shut down.
compressor will stop. (The error is cleared when the temperature has dropped below
248.0°F(120°C)
224.6°F(107°C)
minute compressor running time (total time).
(heat exchanger or outdoor temperature thermistor defective)
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts damage may occur.
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
SiUS04-924
, the
.)
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