Service Diagnosis
50
U0
Description
INSUFFICIENT GAS
Supposed 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
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.
*Remark:
Refer to Appendix A for thermistor resistance checking procedures.(Page 59, item 6.1)
Refer to Appendix A for electronic expansion device checking procedures.(Page 60, item 6.2)
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...
