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LG · Split air conditioners · LG wall-mounted Inverter air conditioners (RAC) – CH codes

CH54Reverse phase detection error

Name in the manufacturer's documentation (service manual): Reverse phase detection error[1]

In plain words (editorial)

Reverse phase detection error. According to LG, it may occur after a temporary power outage or electrical work. LG's first step: reset the air conditioner's circuit breaker.

When to call a service technician: If the error persists, the unit needs an inspection. If it appeared after electrical work, contact the contractor and tell them about the reverse phase detection error.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] LG USA Support – [LG Air Conditioner] Guide to Error Codes (help library, 2026-02-23) – text capture , p. 2 official manufacturer document quote verified inform them of the reverse phase detection error
  2. [2] LG USA Support – [LG Air Conditioner] Guide to Error Codes (help library, 2026-02-23) – text capture , p. 2 official manufacturer document quote verified the ch54 error may occur after a temporary power outage or electrical work.
  3. [3] LG USA Support – [LG Air Conditioner] Guide to Error Codes (help library, 2026-02-23) – text capture , p. 2 official manufacturer document quote verified reset the air conditioner circuit breaker.
  4. [4] LG USA Support – [LG Air Conditioner] Guide to Error Codes (help library, 2026-02-23) – text capture , p. 2 official manufacturer document quote verified if the error persists, the unit will require inspection.
  5. [5] LG USA Support – [LG Air Conditioner] Guide to Error Codes (help library, 2026-02-23) – text capture , p. 2 official manufacturer document quote verified inform them of the reverse phase detection error