Carel Pd

High

ir33 / MPXPRO — Maximum pump-down time exceeded.

Carel Pd: Maximum pump-down time exceeded. This fault noticeably affects operation.

Possible causes

Low pressure did not reach cutoff within time.
Pump-down pressure switch / valve issue.

Check steps

Check pump-down pressure switch & solenoid valve.

Affected parts

Druckschalter
Magnetventil

Safety note

Refrigerant under pressure — follow F-Gas.

Source: Carel resmi servis kılavuzu — CAREL ir33+ User Manual +030220441 rel.2.5, Tab. 8.a p.59: code 'Pd' = 'maximum pump down time alarm'. Body text (line 1290/2353): 'The compressor is stopped, irrespective of the status of the low pressure input. The "Pd" alarm (Pump down ended by timeout) is deactivated... In th…

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

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