LG Mini Split H29 Error Code

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

Check your model first

  • SplitAtlas (LG support table, Mega R-32)
  • LG US official help library
  • Snowflake Aircon

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

Quick answer

LG H29 (CH29) means abnormally high inverter compressor current, often from refrigerant overcharge, blocked refrigerant flow, or poor outdoor ventilation. Clear airflow, reset once; if H29 returns, call a licensed technician.

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 H29 means

H29 (CH29) means compressor current is abnormally high and the compressor has been stopped for protection. SplitAtlas (anchored to LG's support table) lists too much refrigerant charge, obstructed refrigerant flow and improper outdoor ventilation as causes; LG's own US troubleshooting article groups CH29 with CH21/CH23/CH26 as outdoor compressor or circuit-board problems; Snowflake Aircon matches CH29 to compressor/inverter overcurrent rows.

Code meaning varies by series

  • SplitAtlas (LG support table, Mega R-32): CH29 = compressor current abnormally high; refrigerant amount/flow and outdoor ventilation causes
  • LG US official help library: CH21, CH23, CH26, CH29 and E9 indicate a problem with the outdoor unit compressor or circuit board - reset once, then service
  • Snowflake Aircon: CH29 = compressor/inverter overcurrent protection; stop repeated restarts if it returns

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 H21 · LG H22 · LG H30

Commonly searched as: "lg h29" · "lg error code h29" · "lg air conditioner h29"

Sources

Related Mini Split guides

Mini-Split Communication Error: DIY Checks · Mini-Split Flashing Light Decoder: Blink Patterns · Mini-Split Maintenance Checklist: Seasonal DIY Tasks · Mini-Split Not Cooling: Ranked Causes and DIY Checks