Skip to main content
Error code reference
LG Air Conditioner Error Code 181
Water temperature sensor error - abnormal sensor resistance value (open/short).
SourceLG Air Conditioner Outside Unit - Service Manual: ARNU/URNU Seriesp. 130
Diagnostic procedure
The full 181 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
1
First diagnostic step
Check if temperature sensor connector connections are normal.
SourceLG Air Conditioner Outside Unit - Service Manual: ARNU/URNU Seriesp. 130
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock 181 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
1 manual in the MyPros+ library documents this code for LG air conditioner.
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