Electrical Box Temperature Rise - Daikin FTXM-V Series Service Manual

Troubleshooting

4.25 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
Detection compressor off.
Error Decision
 With the compressor off, the radiation fin temperature is above A.
Conditions  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
09/12 class
18/24 class
Supposed  Defective outdoor fan motor
Causes  Short circuit
 Defective radiation fin thermistor
 Disconnection of connector
 Defective outdoor unit PCB
Troubleshooting
Reference
Check No.17 Refer to P.141
Reference
Check No.19 Refer to P.142
128
rises above C and stops when the radiation fin temperature drops below B.
A
(°C) (°F)
122 252
92 198
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 again or
outdoor fan activated?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
B
(°C) (°F) (°C)
64 147 113
70 158 77
YES
Check the radiation fin
temperature.
Above A?
YES
NG
NO
SiUS042113E
C
(°F)
235
171
WARNING
To cool the electrical components,
the outdoor fan starts when the
radiation fin temperature rises
above C and stops when the radiation
fin temperature drops below B.
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.
(R22998)
Part 6 Service Diagnosis