Discharge Pipe Temperature Control - Daikin FTXN09KEVJU Service Manual

Troubleshooting

4.14 Discharge Pipe Temperature Control

F3
Remote
Controller
Display
Method of
An error is determined with the temperature detected by the discharge pipe thermistor.
Malfunction
Detection
 If the temperature detected by the discharge pipe thermistor rises above A, the compressor
Malfunction
Decision
 The error is cleared when the discharge pipe temperature has dropped below B.
Conditions
09/12 class
Stop temperatures
(1) above 50 Hz (rising), above 45 Hz (dropping)
(2) 39 ~ 50 Hz (rising), 34 ~ 45 Hz (dropping)
(3) below 39 Hz (rising), below 34 Hz (dropping)
15/18/24 class
Stop temperatures
(1) above 50 Hz (rising), above 45 Hz (dropping)
(2) 35 ~ 50 Hz (rising), 30 ~ 45 Hz (dropping)
(3) below 35 Hz (rising), below 30 Hz (dropping)
 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
 Defective four-way valve
 Water mixed in refrigerant
 Defective stop valve
 Defective outdoor unit PCB
96
stops.
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
A
°C °F
110 230
105 221
100 212
A
°C °F
118 244.4
110 230
93 199.4
SiUS041111
B
°C °F
97 206.6
92 197.6
87 188.6
B
°C °F
85 185
77 170.6
60 140
Service Diagnosis