Electrical Box Temperature Rise - Daikin FTKN09NMVJU Service Manual

Troubleshooting

4.20 Electrical Box Temperature Rise

L3
Error Code
Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the
compressor off.
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
87
With the compressor off, the radiation fin temperature is above A.
The error is cleared when the radiation fin temperature drops below B.
To cool the electrical components, the outdoor fan starts when the radiation fin temperature
rises above C and stops when it drops below B.
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective 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.
Error again or outdoor
fan activated?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
A
°C °F
82 179.6
90 194
To cool the electrical components,
the outdoor fan starts when the
radiation fin temperature rises
above C and stops when it drops
below B.
YES
Check the radiation fin
temperature.
Above A?
YES
NG
NO
SiUS041501E
B C
°C °F °C
65 149 70
64 147.2 81
WARNING
NO
Replace the outdoor unit
PCB (main PCB).
Replace the outdoor fan
motor.
Correct the connectors
and fan motor lead wire.
Replace the outdoor unit
PCB (main PCB).
Check the installation
condition.
Go to Check No. 17.
Clean up the radiation fin.
(R21671)
Service Diagnosis
°F
158
177.8