Discharge Pipe Temperature Control - Daikin FTXM-V Series Service Manual

SiUS042113E

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
 If the temperature detected by the discharge pipe thermistor rises above A, the compressor
Conditions
 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
09/12 class
(1) above 50 Hz (rising), above 45 Hz (dropping)
(2) 21 ~ 50 Hz (rising), 16 ~ 45 Hz (dropping)
(3) below 21 Hz (rising), below 16 Hz (dropping)
18/24 class
(°C)
118
Supposed
 Defective discharge pipe thermistor
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
Part 6 Service Diagnosis
stops.
A B
(°F) (°C) (°F)
244 85 185
(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
A
(°C)
118
106
98
NG
∗ Discharge pipe thermistor
∗ Outdoor heat exchanger thermistor
∗ Outdoor temperature thermistor
NG
NG
∗ Refrigerant shortage
∗ Four way valve
∗ Water mixed
∗ Stop valve
Troubleshooting
B
(°F) (°C) (°F)
244 85 185
223 73 163
208 65 149
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)
115