Daikin FTKM18PVMK, Service Manual

Page: 88 / 119

Troubleshooting SiMT041509E
73 Service Diagnosis
4.16 Discharge Pipe Temperature Control
Error Code
F3
Method of Error
Detection An error is determined with the temperature detected by the discharge pipe thermistor.
Error Decision
Conditions
„
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.
„
If the error repeats, the system is shut down.
„
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
„
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
Troubleshooting
Check No.01
Refer to P.83
Check No.12
Refer to P.84
Check No.14
Refer to P.85
A (°C) B (°C)
120 104
(R20417)
Caution
NG
OK
OK
OK
NG
NG
∗
Discharge pipe thermistor
∗
Outdoor heat exchanger thermistor
∗
Outdoor temperature thermistor
∗
Refrigerant shortage
∗
Four way valve
∗
Water mixed
∗
Stop valve
Check No. 01
Check the thermistors.
Check No. 14
Check the refrigerant
line.
Check No. 12
Check the electronic
expansion valve.
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).
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.