Haier HPS

Medium

MRV5 IIS (Digitalanzeige-Code) — High pressure switch (HPS) failure — locked permanently if it occurs 3 times in one hour.

Haier HPS: High pressure switch (HPS) failure — locked permanently if it occurs 3 times in one hour. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Condenser poor airflow, refrigerant overcharge, or fan failure.

Check steps

Clean condenser, check fan, verify charge.

Affected parts

Hochdruckschalter

Safety note

Manual reset required after lockout.

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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