LG Mini Split H24 Error Code

Updated 2026-08-30 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-30

Check your model first

The source record does not specify an exact model family.

Match the model on your equipment label to the linked manufacturer documentation. The same code can mean different things across model families.

Quick answer

CH24 on an LG mini split is a pressure-switch trip (high- or low-pressure depending on generation). Clear the outdoor unit and reset once; pressure and refrigerant work is a technician job.

Severity: high · DIY difficulty: easy

Safety

Stop at the breaker power-cycle and any plug-accessible checks (filters, remote settings, visible wiring). The outdoor unit's capacitor holds a lethal charge and the refrigerant circuit is both pressurized and (on R-32 units) flammable — opening panels or servicing the sealed system is licensed-technician work (EPA 608).

What H24 means

H24/CH24 means the outdoor unit is reporting a pressure-switch issue - SplitAtlas (current LG R32 convention) frames it as a high-pressure-switch trip; older tables (universal LG split fault-code PDF, Thermostat & HVAC Helpers) list CH24 as a low/high-pressure switch trip.

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.

Related codes

Cross-references for the same fault family, by brand:

LG H23 · LG H25 · LG H38

Commonly searched as: "lg h24" · "lg error code h24" · "lg air conditioner h24"

Sources

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