Written by
Maya Chen Editorial TeamPublished September 5, 2026Updated October 20, 2026
Error codeCH03
ApplianceDehumidifier
Quick answer
CH03 on an LG dehumidifier: electronic abnormality, 20 second unplug reset, repair if it returns.
Model compatibility: LG reuses codes across series and model years, so CH03 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
CH03 is an electronic abnormality such as a humidistat or main board issue.
Reading CH03
LG lists CH03 with the same electronic fault description as CH01 and CH02: a humidistat or main board issue is the example given.
Reset routine
Take the plug out for 20 seconds.
Reconnect so power is restored.
Should CH03 appear again, the dehumidifier requires repair service.
Other CH messages
Check CH02 or CH01 for the matching entries. CH alone is separate, because it points to a refrigerant leak.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your LG appliance?
Book a specialist visit for a clear estimate and approval before any repair.
