Airwell D3

Critical

High pressure protection via pressure switch (outdoor)

Airwell D3: High pressure protection via pressure switch (outdoor) This fault typically halts operation and needs immediate attention.

Possible causes

Condenser dirty or airflow blocked
Refrigerant overcharge
Faulty HP switch or fan failure

Check steps

Clean condenser and check outdoor fan
Check HP switch, measure high pressure

Affected parts

Druckschalter
Verflüssiger
Lüfter

Safety note

High pressure — relieve before working.

Source: Airwell resmi servis kılavuzu — Airwell VRF Series Engineering Manual, 'Fault and Protection Code List' (page 301, via ManualsLib): D3 = 'High pressure protection for switch 1' (ODU-level fault, level 13 in the manual's classification), i.e. outdoor-unit high-pressure-switch trip. Matches the app's 'Hochdrucksc…

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

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Related fault codes

Communication error outdoor/indoorE0 P5 = protective shutdown due to excessive outdP5 Communication error.E6 High pressure protection (outdoor).P0 Low pressure protection.P1 Compressor overcurrent.P2