CARE

Carel LOP

High

MPXPRO — Minimum evaporation pressure (LOP) alarm - pressure fallen below threshold

Carel LOP: Minimum evaporation pressure (LOP) alarm - pressure fallen below threshold This fault noticeably affects operation.

Possible causes

Valve too closed or refrigerant shortage
Threshold PL1 wrongly set for the application

Check steps

Check refrigerant charge and filter drier for blockage
Check parameter PL1 (threshold) and PL2 (integration time)

Affected parts

filter drier
electronic expansion valve
evaporation pressure probe PEu

Safety note

Refrigerant circuit is pressurized - depressurize and disconnect mains power before servicing

Source: Carel resmi servis kilavuzu (bagimsiz cift-dogrulandi) — Carel MPXPRO User Manual +0300055EN rel.1.6 — Table of alarms: "LOP | Low evaporation temperature alarm" (verified via independent fetch of ManualsLib mirror of the same manual, alarm-table page); cross-checked against the parameter/protection-function description page (Tab. 6.j.d: PL1 "LOP: minimum saturated evapor…

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

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