LG Mini Split H33 Error Code

What H33 means

H33 (CH33) is a high discharge-temperature protection code: the compressor discharge temperature rose excessively. SplitAtlas (anchored to LG's support table) lists refrigerant shortage, blocked refrigerant flow and refrigerant-flow control valve failure; Snowflake Aircon matches CH33 to 'excessive rise of standard compressor discharge temperature' rows on LG Multi V 5 (compressor 2 discharge temperature rose excessively). LG's own support article groups CH33 with refrigerant/compressor problems.

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.