LG A2UW18GFA0 Svc Manual page 95

Multi air conditioner

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Table of Contents

Part 5. Trouble Shooting

Display

Title

code

D-pipe sensor (Inverter)

Air sensor

Condenser Mid-pipesen-

sor

Suction Pipe sensor

Condenser Out-pipe sen-

sor

■ Error Diagnosis and Countermeasure Flow Chart

Is sensor connected

to PCB correctly??

Yes

Is sensor value correct?*

Yes

Replace corresponding

outdoor unit PCB

Ω"

Only for training and service purposes

Cause of error

• Open / Short

• Soldered poorly

• Internal circuit error

• Open / Short

• Soldered poorly

• Internal circuit error

• Open / Short

• Soldered poorly

• Internal circuit error

• Open / Short

• Soldered poorly

• Internal circuit error

• Open / Short

• Soldered poorly

• Internal circuit error

Connect sensor to PCB correctly

Replace sensor

Check Point

1. Estimate the resistance of each sensor.(Unplugged)

2. Check the value of the resistor of thermistor.

D-pipe sensor (Inverter)

Air sensor

Cond. Mid-pipe sensor

Suction pipe sensor

Condenser Out-pipe sensor : Normal Value of the resistor is 5kΩ at 25℃

Check point & Normal condition