What does the Vaillant P11 fault code mean?

Your boiler is currently performing a factory calibration check to ensure the gas and air balance is set correctly for your home's fuel supply.

How much does it cost to fix Vaillant error code P11?

Cost varies. Contact a Gas Safe registered engineer for a quote.

Manufacturer manual

Mid setting point for natural gas (G20)

Shared across the range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like P11: no call-out fees, no surprise bills.

Approved partner

Domestic Appliance Guard

Unlimited call-outs, 24/7 helpline, no price-hike promise

Affiliate links. We may earn a commission at no extra cost to you.

Seeing a different code? Every code this model can display, in one place.

Safety-critical — turn off, read this.

Break-even maths on monthly cover.

7 signs repair isn't worth it anymore.