Discharge Pipe Temperature Control - Daikin FVXG25K2V1B Service Manual

SiBE061121_A

4.18 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
<25/35 class>
(1) above 45 Hz (rising), above 40 Hz (dropping)
(2) 30 ~ 45 Hz (rising), 25 ~ 40 Hz (dropping)
(3) below 30 Hz (rising), below 25 Hz (dropping)
<50 class>
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.106
Check No.12
Refer to P.108
Check No.14
Refer to P.109
Service Diagnosis
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) B (°C)
110 95
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 outdoor 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 outdoor electronic
expansion valve
coil.
OK
Check No. 14
Check the refrigerant
line.
OK
A (°C)
110
105
99
NG
∗
Discharge pipe thermistor
∗
Outdoor heat exchanger thermistor
∗
Outdoor temperature thermistor
NG
NG
∗
Refrigerant shortage
∗
Four way valve
∗
Water mixed
∗
Stop valve
Troubleshooting
B (°C)
97
92
86
Replace the defective
thermistor.
Replace the outdoor
electronic expansion valve
or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R15274)
89