Service Diagnosis
60
U0
Description
INSUFFICIENT GAS
Possible Root
cause
1. Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger,room or
outdoor temperature thermistor.
2. Closed stop valve.
3. Refrigerant shortage (refrigerant leakage).
4. Poor compression performance of compressor.
5. Defective electronic expansion valve.
Troubleshooting
*Remark:
Refer to Appendix A for thermistor resistance checking procedures.(Page 72, item 6.1)
Refer to Appendix A for electronic expansion device checking procedures.(Page 74, item 6.2)
Stop valve closed?
Yes
No
Yes
No
Yes
Yes
Yes
Check indoor and outdoor
coil thermistor.
Put the thermistor back
to actual position.
Check the indoor coil,
outdoor coil and discharge
pipe thermistor resistance.
Thermistor in
actual position?
Resistance
normal?
EXV functioning?
Any leakage?
No
Fully open stop valve.
No
Change thermistor.
No
Change EXV.
No
Check for leakage.
Repair the leak point.
Check stop valve.
Check EXV.
Yes
Refrigerant
charge
sufficient?
Change outdoor PCB.
Check refrigerant charge
level.
Add in refrigerant charge.
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: ......
