Electrical Box Temperature Rise - Daikin 2MXS-W Series Service Manual

SiUS122226EA

7.18 Electrical Box Temperature Rise

L3
Error Code
Outdoor Unit LED
A j 1 i 2 i 3 h 4 i 5 h
Display
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 temperature drops below B.
 To cool the electrical components, the outdoor fan starts when the radiation fin temperature
A
B
C
Supposed
 Defective outdoor fan motor
Causes  Short circuit
 Defective radiation fin thermistor
 Disconnection of connector
 Defective outdoor unit PCB
Troubleshooting
Part 6 Service Diagnosis
rises above C and stops when the radiation fin temperature drops below B.
2/3/4MXS
°C °F
100 212
70 158
85 185
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
5MXS 2/3MXL(H)
°C °F °C
70 158 100
60 140 70
70 158 85
YES
Check the radiation fin
temperature.
Above A?
YES
NG
NO
Troubleshooting for Outdoor Unit
4MXL(H)
°F °C °F
212 70 158
158 60 140
185 70 158
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.
R6000426
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