Service Diagnosis
23
U0
Description
Insuf
fi
cient gas
Supposed Cause
1. Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
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 (Item 1, page 32).
For electronic expansion device checking procedures, please refer to Daikin Procedures.
Summary of Contents for SKYAIR
Page 1: ...R410A SERVICE MANUAL SKYAIR Inverter Single Split SM 5CKY CCY CEY EU A1...
Page 3: ...ii...
Page 29: ...Wiring Diagram 26 Wiring Diagram Model ABQ71 100 125 140AV1 Model ACQ71 100 125AV1...
Page 30: ...Wiring Diagram 27 Model AHQ71AV1 Model AHQ100 125AV1...
Page 31: ...Wiring Diagram 28 Model AHQ140AV1 Model ABQ140BV1...
Page 32: ...Wiring Diagram 29 Model ACQ100 125BV1 Model ABQ71 100CV1...
Page 33: ...Wiring Diagram 30 Model ABQ125 140CV1 Model ACQ71 100 125CV1...
Page 34: ...Wiring Diagram 31 Model AHQ71 100 125CV1 Model AHQ140CV1...
