Fault Codes / Vaillant / F.723

High

flexoTHERM/aroTHERM — Building circuit: pressure too low.

Possible causes

• Leak or air pocket in building circuit.
• Pressure sensor faulty.

Check steps

• Check leaks, top up water & bleed.
• Check pressure sensor, replace if needed.

Affected parts

• Drucksensor Gebäudekreis

Safety note

Source: Vaillant resmi servis kılavuzu — Vaillant flexoTHERM exclusive VWF 57/4 — Installation and Maintenance Instructions (E Fault Codes table, page 45, ManualsLib scan of official manual): "F.723 — Building circuit: Pressure too low — Pressure loss in the building circuit due to leaks or air pockets / defective press…

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

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