Discharge Pipe Temperature Control - Daikin FTX50GV1B Service Manual

Troubleshooting

4.17 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
Conditions
50/60 class
71 class
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.95
Check No.12
Refer to P.96
Check No.14
Refer to P.97
79
If the temperature detected by the discharge pipe thermistor rises above A°C, the
compressor stops.
The error is cleared when the discharge pipe temperature has dropped below B°C.
A (°C)
110
120
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
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Defective electronic expansion valve or coil
Refrigerant shortage
Defective four way valve
Water mixed in refrigerant
Defective stop valve
Defective outdoor unit PCB
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)
95
107
NG
∗
Discharge pipe thermistor
∗
Outdoor heat exchanger thermistor
∗
Outdoor temperature thermistor
NG
NG
∗
Refrigerant shortage
∗
Four way valve
∗
Water mixed
∗
Stop valve
SiBE041029EC
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)
Service Diagnosis