LG Single A Svc Manual page 83

5. Trouble Shooting
6.20 Check code Trouble shooting CH41, CH44, CH45, CH46, CH47, CH65
Display
Title
code
41 D-pipe sensor(Inv)
47 D-pipe sensor(Cons)
44 Air sensor
45 Condenser Pipe sensor
46 Suction Pipe sensor
Heat sink
65
sensor
Check Flow Chart
Unplug the sensor
on Indoor unit PCB
Check the
Connector connection
Is it normal ?
Yes
Estimate the resistance
of each sensor.
Is the resistance of the
Sensor is 200kΩ/10kΩ⁄
/5kΩ at 25˚C?
Yes
Plug the sensor
on Indoor unit PCB
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Only for training and service purposes
Cause of error
• Connector connection error
• Faulty PCB
• Faulty sensor (Open / Short)
• Connector connection error
• Faulty PCB
• Faulty sensor (Open / Short)
• Connector connection error
• Faulty PCB
• Faulty sensor (Open / Short)
• Connector connection error
• Faulty PCB
• Faulty sensor (Open / Short)
No
Correct connection
No
Change the sensor
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Check point & Normal condition
• Normal resistor : 200KΩ/ at 25˚C (Unplugged)
• Normal voltage : 4.5Vdc / at 25˚C (plugged)
• Refer to sensor resistance table.
• Normal resistor : 10KΩ/ at 25˚C (Unplugged)
• Normal voltage : 2.5Vdc / at 25˚C (plugged)
• Refer to sensor resistance table.
• Normal resistor : 5KΩ/ at 25˚C (Unplugged)
• Normal voltage : 2.5Vdc / at 25˚C (plugged)
• Refer to sensor resistance table.
• Normal resistor : 5KΩ/ at 25˚C (Unplugged)
• Normal voltage : 2.5Vdc / at 25˚C (plugged)
• Refer to sensor resistance table.
Estimate the Voltage
of each sensor.
Is the voltage of the
sensor is 4.5Vdc /
2.5Vdc at 25˚C
Yes
Repair or Change the PCB.
Unplugged
Ω
10k
Ω
Check the resistance
No
Change the sensor
Plugged
2.5Vdc
V
Check the voltage
LGE Internal Use Only