Discharge Pipe Temperature Control - Daikin FTXR-T Series Service Manual

SiUS041829E

4.16 Discharge Pipe Temperature Control

F3
Error Code
Method of Error
An error is determined with the temperature detected by the discharge pipe thermistor.
Detection
Error Decision  If the temperature detected by the discharge pipe thermistor rises above A, the compressor
Conditions
 The error is cleared when the discharge pipe temperature has dropped below B.
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
09/12 class
18 class
 If the frequency drops, the temperature is lowered in compensation.
Supposed  Defective discharge pipe thermistor
Causes
 Defective electronic expansion valve or coil
 Refrigerant shortage
 Defective four way valve
 Water mixed in refrigerant
 Defective stop valve
 Defective outdoor unit PCB
Troubleshooting
Reference
Check No.01 Refer to P.112
Reference
Check No.12 Refer to P.114
Reference
Check No.14 Refer to P.115
Note
When replacing the defective thermistor(s), replace the thermistor as ASSY.
Part 6 Service Diagnosis
stops.
A
°C
110
110
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check No. 01
Check the thermistors.
OK
Check No. 12
Check the electronic
expansion valve.
OK
Check No. 14
Check the refrigerant line.
OK
B
°F °C °F
230 88 190.4
230 95 203
NG
∗ Discharge pipe thermistor
∗ Outdoor heat exchanger thermistor
∗ Outdoor temperature thermistor
NG
NG
∗ Refrigerant shortage
∗ Four way valve
∗ Water mixed
∗ Stop valve
Troubleshooting
Replace the defective
thermistor(s).
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB (main PCB).
(R20417)
95