Discharge Pipe Temperature Control - Daikin FTKM-U Series Service Manual

SiMX042215E

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
Error Decision  If the temperature detected by the discharge pipe thermistor rises above A°C, the
Conditions
 The error is cleared when the discharge pipe temperature has dropped below B°C.
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
 12 class
(1) Above 80 Hz (rising), above 75 Hz (dropping)
(2) 40 ~ 80 Hz (rising), 35 ~ 75 Hz (dropping)
(3) Below 40 Hz (rising), below 35 Hz (dropping)
 18 class
 24 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)
Supposed
 Defective discharge pipe thermistor
Causes
 Defective electronic expansion valve or coil
 Refrigerant shortage
 Water mixed in refrigerant
 Defective stop valve
 Defective outdoor unit PCB
Part 6 Service Diagnosis
compressor stops.
80 Hz
40 Hz
A (°C) B (°C)
116 85
50 Hz
21 Hz
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
A (°C)
116
110
110
Frequency
Zone (1)
Zone (2)
Zone (3)
A (°C)
115
103
95
Frequency
Zone (1)
Zone (2)
Zone (3)
Troubleshooting
B (°C)
104
98
88
75 Hz
35 Hz
B (°C)
85
73
65
45 Hz
16 Hz
(R20778)
R6000880
75