Skip to main content
Error code reference
LG Air Conditioner Error Code 242
Central controller receive error - data length from CNU is longer than data length defined at protocol.
SourceLG Air Conditioner - Service Manual: R410A Exploded View (ARUB Series)p. 309
Diagnostic procedure
The full 242 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 CNU; check central controller initialization.
SourceLG Air Conditioner - Service Manual: ARUB Series (R410A)p. 309
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock 242 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
11 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
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax