Daikin FTX-N Series, Service Manual

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Troubleshooting for Outdoor Unit SiUS091601EA
163 Part 6 Service Diagnosis
Reference
7.7 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 , the compressor
stops.
 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

If the frequency drops, the temperature is lowered in compensation.
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.181
A B
(°C) (°F) (°C) (°F)
09 class 110 230 88 190.4
A B
(°C) (°F) (°C) (°F)
12/18/24 class 120 248 107 224.6
15 class 110 230 95 203
(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. 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.
Check No. 01
Check the thermistors.
Check No. 14
Check the refrigerant line.