Radiation Fin Temperature Rise - Daikin FTKM-U Series Service Manual

Troubleshooting

4.23 Radiation Fin Temperature Rise

L4
Error Code
Method of Error
A radiation fin temperature rise is detected by checking the radiation fin temperature with the
Detection compressor on.
Error Decision  The radiation fin temperature with the compressor on is above A °C.
Conditions  The error is cleared when the radiation fin temperature drops below B °C.
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
A (°C)
B (°C)
Supposed
 Defective outdoor fan motor
Causes  Short circuit
 Defective radiation fin thermistor
 Disconnection of connector
 Defective outdoor unit PCB
 Silicone grease not applied properly on the radiation fin after replacing the outdoor unit PCB
Troubleshooting
Note
Refer to Silicone Grease on Power Transistor/Diode Bridge on page 106 for details.
Reference
Check No.17 Refer to P.96
Reference
Check No.19 Refer to P.97
86
12 class
94
82
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn off the power. Then, turn on
the power to restart the system.
Error displayed again?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
18 class 24 class
95.5 73.5
80 57
YES
Has the PCB been
replaced?
NO
Check the radiation fin
temperature.
Above A °C?
YES
NG
NO
SiMX042215E
YES
Check if silicone grease is
applied properly on the
radiation fin. If not, apply
the silicone grease.
NO
Replace the outdoor unit
PCB (main PCB).
Replace the outdoor fan
motor.
Correct the connectors and
fan motor leads.
Replace the outdoor unit
PCB (main PCB).
Check the installation
condition.
Go to Check No. 17.
Clean up the radiation fin.
(R22540)
Part 6 Service Diagnosis