Error code reference

LG Air Conditioner Error Code 45

Heat exchanger temperature sensor (A) fault in outdoor unit: sensor value abnormal (open/short).

SourceLG Air Conditioner - Service Manual: Heat Recovery Outdoor Unit R410A (ARUB80LT2)p. 128

Diagnostic procedure

The full 45 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Check sensor connection to PCB; check sensor resistance value.

SourceLG Air Conditioner - Service Manual: Heat Recovery Outdoor Unit R410A (ARUB80LT2)p. 128

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

88 manuals in the MyPros+ library document this code for LG air conditioner.

Models covered by the manuals that document this code

More models are covered than are listed here.

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The full 45 procedure

Where this code is documented

Models covered by the manuals that document this code

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