LG Mini Split H35 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)
  • Snowflake Aircon (LG Multi V 5 rows)
  • IndexOS

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 H35 (CH35) means excessive low-pressure drop - the low side fell too far, typically from refrigerant shortage, blocked flow, or a flow-control valve fault. Leave the system off and 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 H35 means

H35 (CH35) means the system detected excessive low-pressure drop / the low-side pressure fell below the allowable limit. SplitAtlas (anchored to LG's support table) lists refrigerant shortage, blocked refrigerant flow and refrigerant-flow control valve failure; Snowflake Aircon matches CH35 rows to low-side pressure below allowable limits (Multi V frames 351/352/353); IndexOS independently lists CH35 as a low-pressure alarm from insufficient charge or a leak.

Code meaning varies by series

  • SplitAtlas (LG support table, Mega R-32): CH35 = excessive low-pressure drop; refrigerant shortage / blocked flow / flow-control valve fault
  • Snowflake Aircon (LG Multi V 5 rows): CH35 = low-side pressure fell below allowable limits (master/slave outdoor frames 351/352/353)
  • IndexOS: CH35 = low pressure alarm / refrigerant shortage; leak from fittings, flare joints or heat exchanger

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 H30 · LG H33 · LG H38

Commonly searched as: "lg h35" · "lg error code h35" · "lg air conditioner h35"

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