LG Therma V AHBW A0 Series - Page 69

Trouble Shooting Guide
- 69 -
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Only for training and service purposes
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Plug the sensor
on Indoor unit PCB
Estimate the Voltage
of each sensor.
Repair or Change the PCB.
Check Over load condition
- Refrigerant leakage
- Condenser is blocked
- Outdoor fan is locked
Unplug the sensor
on main PCB 2
Check the
Connector connection
Estimate the resistance
of each sensor.
Is it normal ?
Is the resistance of
the sensor is 5 kΩ
/ 10 kΩ at 25 ℃?
Is the voltage of the
sensor is 4.5 V DC /
2.5 V DC at 25 ℃
Yes
Yes
No
Remove obstruction
Change outdoor fan
or motor
Change refrigerant
Yes
Yes
No
Change the sensor
No
Change the sensor
No
Correct connection
Check Flow Chart
61
62
Condenser
pipe sensor
temp. high
Heat sink sensor
temp. high
• condenser pipe
sensor detected high
temp. (65 ˚C)
• heat sink sensor
detected high temp.
(85 ˚C)
• Check the load condition.
• Check the sensor of Condenser pipe sensor.
• Normal resistor : 5 kΩ at 25 °C (Unplugged)
• Normal voltage : 2.5 V DC at 25 °C (Plugged)
• Check the load condition.
• Check the sensor of heat sink.
• Normal resistor : 10 kΩ at 25 °C (Unplugged)
• Normal voltage : 2.5 V DC at 25 °C (Plugged)
Display
code
Title Cause of error Check point & Normal condition