Error code reference

LG Air Conditioner Error Code 71

Inverter input current (PFC) CT sensor error: micom input voltage not within 2.5V ±0.3V at initial power supply state.

SourceLG Air Conditioner - Service Manual: Heat Recovery Outdoor Unit R410A (ARUB80LT2)p. 139

Diagnostic procedure

The full 71 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 input voltage; replace inverter PCB assembly if voltage is normal.

SourceLG Air Conditioner - Service Manual: Heat Recovery Outdoor Unit R410A (ARUB80LT2)p. 139

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

4 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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