Error code reference

LG Air Conditioner Error Code 124

Temperature sensor of rear-side heat exchanger (B) of sub1 outdoor unit is open or short.

SourceLG Air Conditioner - Service Manual: ARUB Series (R410A)p. 257, 293

Diagnostic procedure

The full 124 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

Refer to CH45 procedure.

SourceLG Air Conditioner - Service Manual: ARUB Series (R410A)p. 257, 293

Unlock with pass

More steps, wiring diagram references, and verified part numbers

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

Unlock 124 procedure $9.95

Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.

Where this code is documented

30 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.

75,000+ service documents · 20,000+ error codes · 100+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax

The full 124 procedure

Where this code is documented

Models covered by the manuals that document this code

Related LG air conditioner error codes