Discharge Pipe Temperature Control - Daikin CTX Series Service Manual

DAMA-SM-21-003

4.15 Discharge Pipe Temperature Control

F3
Error Code
Method of Error
An error is determined with the temperature detected by the discharge pipe thermistor.
Detection
 If the temperature detected by the discharge pipe thermistor rises above A°C (°F), the
Error Decision
Conditions
 The error is cleared when the discharge pipe temperature has dropped below B°C (°F).
 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
Supposed
Causes
 Defective electronic expansion valve or coil
 Refrigerant shortage
 Water mixed in refrigerant
 Defective stop valve
 Defective outdoor unit PCB
Troubleshooting
Reference
Check No.01 Refer to P.85
Reference
Check No.12 Refer to P.86
Reference
Check No.14 Refer to P.88
Note
When replacing the defective thermistor(s), replace the thermistor as ASSY.
Service Diagnosis
compressor stops.
A (°C) B (°C)
07/09/12 116.0 103.0
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Check No. 01
Check the thermistors.
OK
Check No. 12
Check the electronic
expansion valve.
OK
Check No. 14
Check the refrigerant
line.
OK
07/09/12
NG
∗ Discharge pipe thermistor
∗ Outdoor heat exchanger thermistor
∗ Outdoor temperature thermistor
NG
NG
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Troubleshooting
A (°F) B (°F)
240.8 217.4
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).
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