1. Wall Mounted J series
Troubleshooting

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

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

4. Troubleshooting – electrical
Equipment:
Clamp meter
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: 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
Model
Running Current (A)
Input Power (W)
(5)WM15J/JR - (5)SL15C/CR
0.26 59
5WM10J/JR - 5SL10C/CR
0.23 52
WM09J/JR - SL09C/CR
0.20 45
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
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
Model
Compressor model
Single phase ± 7%
Main ()
Aux ()
WM09J/JR -SL09C/CR
2PS156D3CD02
3.841
4.021
WM15J/JR -SL15C/CR
2PS206D2AF02
2.893
4.800
5WM10J/JR - 5SL10C/CR
5PS102DAL01
3.863
3.309
5WM15J/JR - 5SL15C/CR
5PS132DBC01
2.647
4.721
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 close, HP valve open
LP valve open, HP valve close

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
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 ?
2.5 – 4 Ampere?
Measure comp running amp. Within spec?
Change compressor.
Is compressor short body? NO
Compressor OK
YES
YES
Change compressor. NO
Suction = psig
Discharge = 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 ?
Measure compressor running ampere. Within spec?
Change compressor.
2.5 – 4 Ampere?
Is compressor short body? NO
Compressor OK
YES
YES
Change compressor. NO NO
Suction = psig
Discharge = psig
Measure suction pressure. Within spec?
Detect the leak point?
Refer to leak detection method.
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- mechanicalNO
Check fan motor wire connection. Correct?
Reconnect in correct position. `
YES
Check fan motor and replace with another motor.

34. Thank You