Eliwell nPA

High

IDPlus 902/961/971/974 — General pressure switch alarm — pressure alarm activated by general pressure switch, number N of activations below limit PEn; compressor and fans locked, automatic reset

Eliwell nPA: General pressure switch alarm — pressure alarm activated by general pressure switch, number N of activations below limit PEn; compressor and fans locked, automatic reset This fault noticeably affects operation.

Possible causes

Pressure switch (high or low) triggered briefly, e.g. due to load spike or temporary refrigerant pressure rise
Digital input configured for pressure switch (H11=±7) wired incorrectly, or contact dirty/loose

Check steps

Check and remove the cause which triggered the alarm on the digital input (refrigerant charge, condenser condition, fan operation)
Check wiring and PEn/PEI parameters of the pressure switch input

Affected parts

Yüksek/düşük basınç şalteri
dijital giriş kablo/konnektör
kondenser fanı

Safety note

Depressurize the refrigerant circuit and switch off power before intervening. Beware of high-pressure hazard.

Source: Eliwell resmi servis kilavuzu (bagimsiz cift-dogrulandi) — Eliwell IDPlus 902/961/971/974 User Manual, code 9IS54157, EN — verified against two independently fetched releases (rel. 06/15 and rel. 07/11; researcher cited rel. 03/16 which I could not fetch directly, but both editions I did fetch show byte-for-byte identical ALARMS table content for this row, indicating the text…

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

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Related fault codes

Probe 3 (Pb3) faulty — measured value outside E3 Over Heating alarm — Pb3 value has exceeded thCOH General pressure switch alarm (critical) — numPAL Logs the Max/Min value recorded by Pb3 when itHC n Stores the dwell time of the Pb3 value outsidetC n Logs the value recorded by Pb3 on return from bC n