Haier 39-1

Medium

MRV5 IIS (Digitalanzeige-Code) — Compression ratio too high (>12.0) for 5 consecutive minutes — protection.

Haier 39-1: Compression ratio too high (>12.0) for 5 consecutive minutes — protection. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Extreme pressure difference between suction and discharge, e.g. from low refrigerant or condenser blockage.

Check steps

Check operating pressures, refrigerant charge, and condenser.

Affected parts

Verdichter

Safety note

Refrigerant under pressure — use PPE.

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.

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