P.000 Low

Vaillant P.000 Fault Code

Also written as P000 — same fault.

The Vaillant P.000 fault code means: your boiler is currently running an automatic air-clearing sequence, which is a normal process after maintenance or a power restart.. It appears on 3 Vaillant models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Purgeprogramme

DIY fix possible

Wait for the sequence to complete automatically, which usually takes a few minutes.Do not switch off the power while the programme is running.If it stays on the screen for over 15 minutes, restart the boiler.

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Vaillant models that show the P.000 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Vaillant P.000 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026