Service Diagnosis
48
L4
Description
Heat sink overheat
Supposed 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 fi n after replacing outdoor unit PCB.
Troubleshooting
Yes
Error displayed
again?
Yes
Yes
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
*Remark:
Refer to Appendix A for outdoor fan system check.(Page 65, item 6.8)
Refer to Appendix A for installation condition check. (Page 65, item 6.7)
Summary of Contents for FTXB50BV1B
Page 1: ...SERVICE MANUAL Inverter DOO 0RXQWHG Single Split SM 5WMY A1 R410A...
Page 60: ...Wiring Connection 54 4 0 Wiring Connection Model ATXN FTXN 25 35L M ARXN RXN 25 35L M...
Page 61: ...Wiring Connection 55 Model ATXN FTXN 50 60L ARXN RXN 50 60L...
Page 62: ...Wiring Connection 56 Model ATXN FTXN 50 60M ARXN RXN 50 60M...
