![background image](http://html1.mh-extra.com/html/daikin/ftxn25l/ftxn25l_service-manual_4200014050.webp)
Service Diagnosis
42
E5 (All models except ARXN/RXN50/60L , RXB50/60A)
Description
COMPRESSOR OVERLOAD
Possible Root
cause
1. Refrigerant Shortage.
2. 4 way valve malfunction.
3. Stop valve malfunction.
4. Outdoor unit PCB defective.
5. Water mixed in refrigerant.
6. Electronic expansion valve defective.
7. Disconnection of discharge pipe thermistor.
8. Faulty discharge pipe thermistor.
9. Disconnection of connector S40.
10. Electronic expansion valve or coil malfunction.
11. Disconnection of 2 terminals of OL.
Troubleshooting
No
Yes
Malfunction?
Malfunction?
Yes
No
Yes
Yes
Thermistor
resistance normal?
Disconnect connector
S40 from PCB.
Replace electronic expansion or the coil.
Discharge pipe
thermistor
disconnected?
No
Yes
Insert thermistor in position.
Check resistance of 2 terminals
connector S40.
Malfunction?
Resistance between
2
Disconnect 2 terminals of OL.
Replace outdoor PCB.
No
# Refer to thermistor resistance table.(Page 72, item 6.1)
Replace thermistor.
Refer refrigerant line
check procedures.
Connectors
properly
connected?
Yes
Check electronic expansion.
Replace four way valve or
the coil.
Replace outdoor PCB.
No
Check four way valve.
Check refrigerant line.
Connect back the connectors.
Disconnect 2
terminals of OL.
Disconnect 2
terminals of OL.
No
Yes
No
No
Yes
Yes
*Remark:
Please refer to Appendix A for Electronic expansion valve (page 74,item 6.2), four way valve (page 74,item
6.3) and refrigerant line checking procedures (page 75,item 6.4).
Summary of Contents for FTXN25L
Page 2: ......
Page 4: ...Table of Contents ii 4 0 Wiring Connection 64 5 0 Refrigerant Diagram 70 6 0 Appendix A 72...
Page 88: ......