Carel LO2

High

MPXPRO — Low temperature alarm 2 (second set point St2 / intake probe)

Carel LO2: Low temperature alarm 2 (second set point St2 / intake probe) This fault noticeably affects operation.

Possible causes

Excessive cooling capacity or double thermostat function (rd2) active with wrong set point
Probe AA2 wrongly assigned or faulty

Check steps

Check threshold AL2 and set point St2
Check assigned probe (par. AA2) and its reading

Affected parts

intake probe Sr
control probe

Safety note

General note: disconnect power before servicing

Source: Carel resmi servis kilavuzu (bagimsiz cift-dogrulandi) — Carel MPXPRO User Manual +0300055EN (rel. 1.0/1.6 — aynı kılavuğun farklı revizyonlarında görülüyor), §9.2 Table of Alarms: "LO2 | Low temperature alarm" (LO'nun St2'ye bağlı ikinci-set varyantı); eşik/prob ataması §9.5 Alarm Parameters: AL2/AH2 (eşikler, St2'ye göreli ya da mutlak — A2 parametresiyle seçilir), AA2 (…

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

Look up in Enthalio →

Related fault codes

Low superheat alarm, risk of liquid refrigeranLSH Low suction temperature alarmLSA Minimum evaporation pressure (LOP) alarm - preLOP Communication error with stepper driverEdc Type HA HACCP alarm - high temperature during HA Type HF HACCP alarm - high temperature after pHF