Electrical Box Temperature Rise - Daikin CTX Series 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
Detection compressor off.
 With the compressor off, the radiation fin temperature is above A °C (°F).
Error Decision
 The error is cleared when the radiation fin temperature drops below B °C (°F).
Conditions
 To cool the electrical components, the outdoor fan starts when the radiation fin temperature
 Defective outdoor fan motor
Supposed
 Short circuit
Causes
 Defective radiation fin thermistor
 Disconnection of connector
 Defective outdoor unit PCB
Troubleshooting
Reference
Check No.17 Refer to P.89
Reference
Check No.19 Refer to P.90
78
rises above C °C and stops when the radiation fin temperature drops below B °C (°F).
A (°C) B (°C)
07/09/12 90.0 75.0
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
C (°C)
81.0 07/09/12
To cool the electrical components,
the outdoor fan starts when the
radiation fin temperature rises
abo C °C (°F) The outdoor fan stops
when the radiation fin temperature
YES
drops below B °C (°F)
Check the radiation fin
temperature.
Above A°C (°F)?
YES
NG
NO
DAMA-SM-21-003
A (°F) B (°F) C (°F)
194.0 167.0 177.8
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.
Service Diagnosis