LG Mini Split H93 Error Code

What H93 means

CH93 indicates a communication problem between the indoor and outdoor units. LG notes it typically occurs during the test run when communication between the units is not stable, and that for models released after 2021 it can also appear if the outdoor unit is not receiving power - those models use a changed communication-line configuration with separate power cords for indoor and outdoor, and both units must be connected to power. It may also occur temporarily from unstable power or other electrical factors. SplitAtlas summarizes CH93 the same way.

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

1. 1. One-time fault event (power disturbance or transient sensor reading) common DIY

   Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.

   Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.

2. 2. Fault persists after a clean reset occasional pro only

   Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).

   Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.