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Lg Mini Split H04 Error Code
Quick answer
H 04 means condensate water is not being removed the way the unit expects, or a full-water condition is being detected on models that use that display. If water is present at the indoor unit, treat it as a fault that can cause water damage. Advisory Technician Breadth evidence 6 published catalog models on its documented product line. Safe first check Turn the unit off if water is visible. Check only the outside end of the drain for an obvious blockage or kink, then power cycle once at the breaker if you can do that safely. Do not open the indoor unit.
Severity: high · DIY difficulty: intermediate
Safety
TBD - must be written per-code before publish
What H04 means
H 04 means condensate water is not being removed the way the unit expects, or a full-water condition is being detected on models that use that display. If water is present at the indoor unit, treat it as a fault that can cause water damage. Advisory Technician Breadth evidence 6 published catalog models on its documented product line. Safe first check Turn the unit off if water is visible. Check only the outside end of the drain for an obvious blockage or kink, then power cycle once at the breaker if you can do that safely. Do not open the indoor unit.
Causes, ranked
Causes not yet documented — verify against the service manual.
Sources
- SplitAtlas manual-sourced reference — verified 2026-08-29