P.00 Low

Vaillant P.00 Fault Code

Also written as P00 — same fault.

The Vaillant P.00 fault code means: your boiler is simply running a self-cleaning routine to remove trapped air from the system and is not actually at fault.. It appears on 27 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: Purging: The internal pump is cyclically actuated. The heating circuit and the domestic hot water circuit are adaptively purged by automatically switching the circuits using the automatic air vent.

What causes the Vaillant P.00 fault?

This code appears when the boiler detects potential air pockets inside the internal pipework or heat exchanger. It physically triggers the pump to pulse on and off to push those air bubbles toward the automatic bleed valve so they can be safely released. This usually happens after the system has been drained for a repair or when the boiler is first powered on.

This is more common in autumn when homeowners turn their heating back on for the first time or after radiators have been bled and the system re-pressurised.

DIY fix possible

Wait for 5 to 10 minutes for the program to finish automaticallyEnsure your radiator valves are open to help air move through the systemCheck the boiler pressure gauge is in the green zone (typically 1 to 1.5 bar)

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Vaillant models that show the P.00 fault code

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

Source

Vaillant P.00 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 27 April 2026