LG Mini-Split Code CH24
Hard lockoutShown as: Outdoor LED1 blinks 2 times, LED2 blinks 4 times
Pressure switch / heat sink protection has tripped. The outdoor unit's protective switch opened, which normally means the system cannot reject heat - blocked coil, blocked airflow, or a refrigerant-side problem.
Manual wording: “24 Pressure Switch / Heater Sink.”
Documented for: LUU090HV ~ LUU420HV and LUU180HHV / LUU240HHV single-zone outdoor units
What you can safely check yourself
- Clear leaves, grass clippings, snow, or debris away from the outdoor coil and fan
- Remove anything stacked against or on top of the outdoor unit
- Check and clean the indoor air filters
- Make sure the indoor supply and return grilles are open
When to call a technician
A tripped pressure switch is a protection device doing its job. Never bypass, jumper, or reset a pressure switch - a technician has to find why it tripped.
A LG mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Single Zone Four-Way Ceiling-Cassette Installation Manual (LG Electronics U.S.A., Inc., Single-zone four-way ceiling cassette indoor units with LUU090HV through LUU420HV outdoor units) · checked 2026-08-25
- Convertible Mid-Static Ducted LGRED Degree System Installation Manual (LG Electronics U.S.A., Inc., LGRED single-zone convertible mid-static ducted indoor units with LUU180HHV / LUU240HHV outdoor units) · checked 2026-08-25