Radiation Fin Temperature Rise - Daikin FTKN09NMVJU Service Manual

SiUS041501E

4.21 Radiation Fin Temperature Rise

L4
Error Code
Method of Error A radiation fin temperature rise is detected by checking the radiation fin thermistor with the
compressor on.
Detection
Error Decision
Conditions
09/12 class, RKN18NMVJU
RXN18NMVJU, RK(X)18NMVJU, 24 class
Supposed
Causes
Troubleshooting
Check No.17
Refer to P.98
Check No.19
Refer to P.99
Note: Refer to Silicon Grease on Power Transistor / Diode Bridge on page 108 for detail.
Service Diagnosis
If the radiation fin temperature with the compressor on is above A.
The error is cleared when the radiation fin temperature drops below B.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
Silicon grease is not applied properly on the radiation fin after replacing the outdoor unit PCB.
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn off the power and turn it on
again to start the system.
Error displayed again?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
A
°C °F
99 210.2
100 212
YES
Has the PCB been
replaced?
NO
Check the radiation fin
temperature.
Above A?
YES
NG
NO
Troubleshooting
B
°C °F
70 158
57 134.6
YES
Check if silicon grease is
applied properly on the
radiation fin. If not, apply
the silicon 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.
(R21672)
88