Daikin SKYAIR, Руководство по обслуживанию

Страница: 26 / 38

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.