Wall Mounted J series Troubleshooting

1. Wall Mounted J series Troubleshooting

2. Troubleshooting Troubleshooting area Electrical circuit / hardware Refrigerant circuit / component

3. Troubleshooting - electrical Topics: • Measuring equipment • Unit fails to start • Error codes

4. Troubleshooting – electrical Equipment: • Clampmeter • Multi-meter • Thermocouple reader Measuring equipment

5. Troubleshooting - electrical • Diagnostic Flow Chart Not applicable 1 Unit fails to start

6. Troubleshooting - electrical • Diagnostic Flow Chart 1 Not applicable Unit fails to start

7. Troubleshooting - electrical • Power supply Power source: 220-240 V Rated running current: 0.17 A Unit fails to start

8. Troubleshooting - electrical • Fuse • Continuity check • Component shorted • Loose connection Unit fails to start

9. Troubleshooting - electrical • ID fan motor Black wire Unit fails to start

10. Troubleshooting - electrical • ID fan motor electrical data 230V / Single phase Unit fails to start

11. Troubleshooting - electrical • OD fan motor cooling model Unit fails to start

12. Troubleshooting - electrical • OD fan motor – heat pump Unit fails to start

13. Troubleshooting - electrical • Compressor winding resistance Remove the cap C – Common Main – C & S S – Starting Auxiliary – R & C R – Running Unit fails to start

14. Troubleshooting - electrical • Compressor winding resistance 1. Measure resistance value - main - auxiliary 2. Continuity check – if “BEEP” sound is obtained > component short Unit fails to start

15. Troubleshooting - electrical • Compressor winding resistance Unit fails to start

16. Troubleshooting - electrical • LED error indicators Error codes

17. Troubleshooting - electrical • Room sensor contact open/short Blink 1 time • Sensor RTH201 • Possibility – low • Unit design with air opening at the front panel to allow sufficient space for air flow & measurement • 10 C < operating temp. < 40 C Error codes

18. Troubleshooting - electrical • ID coil sensor open/short Blink 2 times + Blinking - 10 C < operating temp. < 68 C Error codes

19. Troubleshooting - electrical • OD coil sensor open/short Blink 3 times - 10 C < operating temp. < 68 C Error codes

20. Troubleshooting- mechanical Charging Method Diagram shows typical charging method. Refrigerant circuit checks

21. Troubleshooting- mechanical • Pressure gauge

22. Troubleshooting- mechanical • Pressure measurement Both valve closed

23. Troubleshooting- mechanical • Charging refrigerant LP valve open, HP valve close LP valve close, HP valve open

24. Troubleshooting - mechanical Vacuuming Method 1) Open the service port core cap. 2) Connect pressure gauge to the service port. 3) Connect the line to vacuum pump. Open the charging manifold valve and turn the pump on. Vacuum to –0.1 MPa (-760mmHg) or lower. (Evacuation time varies by the pump but averagely in 1 hour). Refrigerant circuit checks

25. Troubleshooting- mechanical • Vacuum pumping Valve open

26. Troubleshooting-mechanical • Compressor Overload LED display - Blink 1 time (Cooling) When OD coil temperature > 68 °C, both the compressor and outdoor fan will stop operating. (Heating) When ID coil temperature > 68 °C, the compressor, outdoor fan and 4 way valve will stop operating.

27. Troubleshooting-mechanical Measure ID/OD on coil temperature > 68°C ? YES NO NO Sufficient airflow? Ensure no obstacle around the unit and conduct inspection on coil and filter. YES NO Connect correctly and operate again. Is the coil sensor correctly connected? YES NO Is the coil sensor resistance characteristics normal? Replace sensor. YES NO NO Measure compressor winding resistance. Within spec ? Change compressor. Measure comp running amp. Within spec? 2.5 – 4 Ampere? Is compressor short body? NO Compressor OK YES YES Change compressor. NO Suction = 116-154 psig Discharge = 297-523 psig Unit overcharged. Recover all gas. Measure suction pressure. Within spec? YES Recharging with correct amount of refrigerant. System ok.

28. Troubleshooting-mechanical • Gas Leak LED display - Blink 3 times After compressor’s run time of 30 minutes is achieved, gas leak is declared if: ID coil temperature > 25°C (cooling) or < 20°C ( heating )

29. Troubleshooting-mechanical Turn on the unit NO Is the coil sensor correctly connected? Connect correctly and operate again. YES NO Is the coil sensor resistance characteristics normal? Replace sensor. YES NO NO Measure compressor winding resistance. Within spec ? Change compressor. Measure compressor running ampere. Within spec? 2.5 – 4 Ampere? Is compressor short body? NO Compressor OK YES YES Change compressor. NO NO Refer to leak detection method. Suction = 116-154 psig Discharge = 297-523 psig Measure suction pressure. Within spec? Detect the leak point? YES YES Fix the leak point. System ok.

30. Troubleshooting- mechanical • Hardware Error (tact switch pin open) LED display - Blink 6 times Possible root cause: ON/OFF tact switch accidentally pressed by front cover and could not restore back to normal position.

31. Troubleshooting- mechanical Visual inspection on the ON/OFF. NO ON/OFF pressed by cover? YES Press once on the ON/OFF button for 1 second.

32. Troubleshooting- mechanical • No feedback from indoor fan motor LED display - OFF + Blink 4 times Possible root cause: Incorrect fan motor wire connection / defective fan motor.

33. Troubleshooting- mechanical NO Check fan motor wire connection. Correct? Reconnect in correct position. ` YES Check fan motor and replace with another motor.

34. Thank You