Discharge Pipe Temperature Control - Daikin SUPER MULTI NX G Series Service Manual

Troubleshooting

5.16 Discharge Pipe Temperature Control

F3
Remote
Controller
Display
Outdoor Unit LED
A 5
Display
Method of
Detected by the discharge pipe thermistor
Malfunction
Detection
 If the temperature detected by the discharge pipe thermistor rises above
Malfunction
Decision
 The error is cleared when the discharge pipe temperature is dropped below
Conditions
 If the error repeats 6 times, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
 Refrigerant shortage
Supposed
 Defective four-way valve
Causes
 Defective discharge pipe thermistor
 Defective outdoor unit PCB
 Water mixed in refrigerant
 Defective electronic expansion valve
 Defective stop valve
Troubleshooting
Check No.04
Refer to P.150
Check No.06
Refer to P.152
Check No.11
Refer to P.155
123
1 4 2 1 3 4 4 1
stops.
120°C (248°F)
107°C (225°F)
(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. 06
Check the thermistors.
Functioning
Check No. 04
Check the electronic
expansion valve.
Functioning
Check No. 11
Check the refrigerant
line.
Functioning
Malfunctioning
 Discharge pipe thermistor
 Outdoor heat exchanger thermistor
 Outdoor temperature thermistor
Malfunctioning
Malfunctioning
 Refrigerant shortage
 Four way valve
 Water mixed
 Stop valve
SiUS12-928_A
, the compressor
.
Replace the defective
thermistor.
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R7141)
Service Diagnosis