Electrical Box Temperature Rise - Daikin 4MXS-R Series Service Manual

Troubleshooting for Outdoor Unit

7.18 Electrical Box Temperature Rise

L3
Error Code
j
Outdoor Unit LED
A
Display
Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the
Detection compressor off.
Error Decision
Conditions
100°C (212°F)
Supposed
Causes
Troubleshooting
Check No.17
Turn off the power. Then, turn on
Refer to P.216
the power to restart the system.
Check No.19
Refer to P.217
205
i i h i
1 2 3 4
With the compressor off, the radiation fin temperature is above
The error is cleared when the temperature drops below
To cool the electrical components, the outdoor fan starts when the radiation fin temperature
rises above and stops when it drops below
C
A B
70°C (158°F)
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.
Error again or outdoor
fan activated?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
h
5
.
B
C
85°C (185°F)
To cool the electrical components,
the outdoor fan starts when the
radiation fin temperature rises
above C. The outdoor fan stops
when the radiation fin temperature
drops below B.
YES
Check the radiation fin
temperature.
Above A?
YES
NG
NO
SiUS121736EA
.
A
B .
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.
(R22272)
Service Diagnosis