LG CH05 error code: indoor-outdoor communication error

What Does Error CH05 Mean?

LG's documented CH05 code indicates an indoor-to-outdoor communication error; the same service table groups related CH53 and CH93 communication conditions by system context. Applies to: LG single-zone systems in MFL41161610 This page follows the LG general service manual for single-zone ductless systems. LG multi-zone and ducted ranges maintain their own code tables, and a CH number read from a different manual is not interchangeable, so confirm the model against the manual before relying on this definition. Owner-safe checks: Record the complete code, model numbers, and whether either unit shows signs of power. | Note whether the code followed an outage, installation, or other electrical work without opening a panel. Qualified technician: Terminal, grounding, resistance, motor, and PCB checks in the service manual require a qualified technician. | Wait-time and stored-energy warnings in the service literature must be followed before electrical access.