Wall Mounted J series Troubleshooting

Troubleshooting area Troubleshooting Electrical circuit / hardware Refrigerant circuit / component

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

Troubleshooting – electrical Equipment: Clamp meter Multi-meter Thermocouple reader Measuring equipment

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

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

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

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

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

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

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

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

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

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

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

Troubleshooting - electrical LED error indicators Error codes

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

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

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

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

Troubleshooting- mechanical Pressure gauge

Troubleshooting- mechanical Pressure measurement Both valve closed

Troubleshooting- mechanical Charging refrigerant LP valve close, HP valve open LP valve open, HP valve close

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

Troubleshooting- mechanical Vacuum pumping Valve open

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.

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 = 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.

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 )

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 = 116-154 psig Discharge = 297-523 psig Measure suction pressure. Within spec? Detect the leak point? Refer to leak detection method. YES YES Fix the leak point. System ok.

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.

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.

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.

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

Thank You