Radiation Fin Temperature Rise - Daikin CTX Series Service Manual

DAMA-SM-21-003

4.21 Radiation Fin Temperature Rise

L4
Error Code
Method of Error
A radiation fin temperature rise is detected by checking the radiation fin temperature with the
compressor on.
Detection
 The radiation fin temperature with the compressor on is above A °C (°F).
Error Decision
 The error is cleared when the radiation fin temperature drops below B °C (°F).
Conditions
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
 Defective outdoor fan motor
Supposed
 Short circuit
Causes
 Defective radiation fin thermistor
 Disconnection of connector
 Defective outdoor unit PCB
 Silicone grease not applied properly on the radiation fin after replacing the outdoor unit PCB
Troubleshooting
Turn off the power. Then, turn on
the power to restart the system.
Reference
Refer to Silicone Grease on Power Transistor/Diode Bridge on page 95 for details.
Reference
Check No.17 Refer to P.89
Reference
Check No.19 Refer to P.90
Service Diagnosis
A (°C) B (°C)
07/09/12 90.0
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Error displayed again?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
84.0 07/09/12
YES
Has the PCB been
replaced?
NO
Check the radiation fin
temperature.
Above A °C (°F)?
YES
NG
NO
Troubleshooting
A (°F) B (°F)
194.0 183.2
YES
Check if silicone grease is
applied properly on the
radiation fin. If not, apply
the silicone grease.
NO
Replace the outdoor unit
PCB (main PCB).
Replace the outdoor fan
motor.
Correct the connectors and
fan motor leads.
Replace the outdoor unit
PCB (main PCB).
Check the installation
condition.
Go to Check No. 17.
Clean up the radiation fin.
79