Daikin FTXN50L - L4: Heat Sink Overheat

Service Diagnosis
58
L4
Description Heat sink overheat
Possible Root
cause
1. Fin temperature rise due to short circuit.
2. Fin temperature rise due to defective outdoor unit fan.
3. Fin thermistor defective.
4. Connector in poor contact.
5. Outdoor unit PCB defective.
6. SilicongreaseisnotappliedproperlyontheradiationnafterreplacingoutdoorunitPCB.
Troubleshooting
*Remark:
Refer to Appendix A for outdoor fan system check.(Page 77, item 6.7)
Refer to Appendix A for installation condition check. (Page 77, item 6.6)
Yes
Error displayed
again?
seYseY
No
Turn off the power and turn it on
again to start the system.
Has the PCB been
replaced?
Above A°C?
Check the radiation fin
temperature.
Check the
outdoor fan.
Malfunction
No
Functioning
Radiation fin dirty?
Yes
Check if silicon grease is
applied properly on the
radiation fin. If not, apply
the silicon grease.
Replace the outdoor fan
motor.
Correct the connectors and
fan motor leads.
Replace the outdoor unit
PCB.
Replace the outdoor unit
PCB.
Check the installation
condition.
Clean up the radiation fin.
No
No
Models A°C
ARXN/RXN50/60L 85
ARXN/RXN25/35M 93
ARXN/RXN50/60M,RXB50/60B 85