LG Mini-Split Code CH28
Soft lockoutShown as: Outdoor LED1 blinks 2 times, LED2 blinks 8 times
Inverter compressor DC voltage is too high. The DC bus feeding the compressor drive has gone over its limit and the unit shut down to protect itself.
Manual wording: “Inverter compressor DC voltage is too high.”
Documented for: LS091HSV / LS121HSV systems (LSN091HSV / LSN121HSV indoor, LSU091HSV / LSU121HSV outdoor)
Likely causes, most common first
- Inverter compressor DC voltage is too high
What you can safely check yourself
- Check the breaker is fully on and not partially tripped
- If the house has just had a power surge or outage, turn the system off at the breaker for three minutes and back on
When to call a technician
DC bus overvoltage is measured on a live, charged inverter board - technician only.
A LG mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Defining Common Error Codes - Standard Wall-Mounted High-Efficiency Single Zone Systems (LG Electronics U.S.A. - Commercial Air Conditioning, LS091HSV and LS121HSV systems (LSN091HSV / LSN121HSV indoor units, LSU091HSV / LSU121HSV outdoor units)) · checked 2026-08-25