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Mitsubishi Electric · Split air conditioners · Mitsubishi Electric MSZ-AP (wall-mounted split, R32)

Blinks every 0.5 sMiswiring or serial signal

Name in the manufacturer's documentation (service manual): Miswiring or serial signal[1]

In plain words (editorial)

The indoor unit does not receive the serial signal from the outdoor unit (for 6 minutes) – the service manual names miswiring of the indoor-outdoor connection, the power supply, or electrical noise, e.g. from inverter-controlled lighting. It warns that electric charge may remain right after the power is turned off and to wait 3 minutes before working on the unit.

When to call a service technician: Contact an authorised Mitsubishi Electric service technician.

✎ 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] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 34 official manufacturer document quote verified Miswiring
  2. [2] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 34 official manufacturer document quote verified The serial signal from the outdoor unit is not
  3. [3] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 34 official manufacturer document quote verified The indoor unit is connected to a low-stand
  4. [4] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 40 official manufacturer document quote verified Turn OFF inverter-controlled lighting
  5. [5] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 40 official manufacturer document quote verified Is there rated voltage in the power supply?
  6. [6] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 40 official manufacturer document quote verified Check for incorrect indoor-outdoor connecting wiring.
  7. [7] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 40 official manufacturer document quote verified The connection information to the Multi series is stored
  8. [8] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 40 official manufacturer document quote verified Check for miswiring, broken wires, and loose
  9. [9] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 40 official manufacturer document quote verified Replace the outdoor inverter P.C. board.
  10. [10] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 40 official manufacturer document quote verified Electric charge may remain immediately