Discharge Pipe Temperature Control - Daikin FTX20K(2)V1B Service Manual

SiBE041525F

4.15 Discharge Pipe Temperature Control

F3
Error Code
An error is determined with the temperature detected by the discharge pipe thermistor.
Method of Error
Detection
 If the temperature detected by the discharge pipe thermistor rises above A°C, the
Error Decision
Conditions
 The error is cleared when the discharge pipe temperature has dropped below B°C.
20/25/35 class
50/60/71 class
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
 Defective discharge pipe thermistor
Supposed
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
Check No.01
Refer to P.79
Check No.12
Refer to P.81
Check No.14
Refer to P.82
Service Diagnosis
compressor 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 (°C)
88
95
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)
68