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

Upper lit, lower blinkingMXZ type operation mode setting

Name in the manufacturer's documentation (service manual): MXZ type operation mode setting[1]

In plain words (editorial)

Multi-split (MXZ) system: indoor units connected to the same outdoor unit are set to COOL (including DRY) and HEAT at the same time. The service manual's remedy: set all indoor units to the same operation mode.

When to call a service technician: If the indicator stays after unifying the modes, contact a 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. 35 official manufacturer document quote verified Upper lamp lights and lower lamp blinks.
  2. [2] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 35 official manufacturer document quote verified the operation mode of the each indoor unit
  3. [3] Mitsubishi Electric – Service Manual: Indoor unit MSZ-AP25VG(K) … MSZ-AP71VG(K) (OBH788 REVISED EDITION-B) (OBH788 REVISED EDITION-B) , p. 35 official manufacturer document quote verified unify the operation mode