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Problem in Water-
17
inlet sensor
Problem in
18
Water-outlet
sensor
Problem in
19
Elec/Heater Water-
Outlet Sensor
Check Flow Chart
Unplug the sensor
on PCB(Heater)
Check the
Connector connection
Is it normal ?
Yes
Estimate the resistance
of each sensor.
Is the resistance of
the sensor
5 k at 25 ˚C?
Yes
Plug the sensor
on Unit PCB(Heater)
Check Point
1. Unplug the sensor on PCB(Heater).
2. Estimate the resistance of each sensor.
3. If the resistance of the sensor is 5KΩ at 25°C, then sensor is normal.
4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. ' Change the sensor.
5. Plug the sensor on PCB(Heater) and Power ON.
6. Estimate the voltage of each sensor.
7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal.
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ' Repair or Change the PCB.
Cause of error
• Connector connection error
• Faulty PCB(Heater)
• Faulty sensor (Open / Short)
• Connector connection error
• Faulty PCB(Heater)
• Faulty sensor (Open / Short)
• Connector connection error
• Faulty PCB(Heater)
• Faulty sensor (Open / Short)
No
Correct connection
No
Correct connection
- 81 -
Check point & Normal condition
Normal resistor : 5 KΩ / at 25 ˚C (Unplugged)
Normal voltage : 2.5 V dc / at 25 ˚C (Plugged)
Refer to sensor resistance table.
Normal resistor : 5 KΩ / at 25 ˚C(Unplugged)
Normal voltage : 2.5 V dc / at 25 ˚C(Plugged)
Refer to sensor resistance table
Normal resistor : 5 KΩ / at 25 ˚C (Unplugged)
Normal voltage : 2.5 V dc / at 25 ˚C (Plugged)
Refer to sensor resistance table.
Estimate the Voltage
of each sensor.
Is the voltage of
the sensor 2.5 V dc
at 25 ˚C
Yes
Repair or Change the PCB.
Unplugged
5k
Check the resistance
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.
No
Correct connection
Plugged
2.5Vdc
V
Check the voltage
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Troubleshooting
