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Error code reference
LG Air Conditioner Error Code 201
HR unit liquid pipe sensor error - liquid pipe sensor of HR unit open or short.
SourceLG Air Conditioner Outside Unit - Service Manual: ARNU/URNU Seriesp. 132
Diagnostic procedure
The full 201 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 connection condition of temperature sensor and lead cable; measure sensor resistance.
SourceLG Air Conditioner Outside Unit - Service Manual: ARNU/URNU Seriesp. 132
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
12 manuals in the MyPros+ library document this code for LG air conditioner.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
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