Haier 28-30

High

MRV5 IIS (Digitalanzeige-Code) — Number of connected indoor units detected as less than the set number, for 300 seconds.

Haier 28-30: Number of connected indoor units detected as less than the set number, for 300 seconds. This fault noticeably affects operation.

Possible causes

Communication wiring to one or more indoor units broken or configuration incorrect.

Check communication wiring of all indoor units, match configuration with actual count.

—

Source: Haier Service Manual MRV5 IIS Mini-Außengeräte (SYJS-06-2021 REV.A), §17 Failure Code — Inverter Outdoor Unit Failure Code table, p.57ff

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.