HVAC Code Lookup

LG Mini-Split Code CH54

Hard lockoutShown as: Outdoor LED01 (red) blinks 5 times, LED02 (green) blinks 4 times

Open phase / reverse phase error - the outdoor unit's incoming power is missing a leg or wired in the wrong order. LG's consumer page notes this usually shows up after a power outage or electrical work.

Manual wording: “Outdoor unit is not wired properly (ex: reversed phase)”

Documented for: All LG residential mini-split outdoor units

Likely causes, most common first

  1. Outdoor unit is not wired properly (for example, reversed phase)
  2. A power leg lost or reconnected in the wrong order after an outage or electrical work

What you can safely check yourself

  • Check the breaker feeding the outdoor unit is fully on and not partially tripped
  • Check the outdoor disconnect switch is fully seated and on

When to call a technician

If this appeared after a power outage, a panel change, or any electrical work, an electrician or HVAC technician needs to confirm the incoming power was reconnected correctly. Do not open the outdoor unit's electrical box.

A LG mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Sources

Other LG codes