Medium
I.144 on Vaillant ecoTEC plus Combi

Your boiler’s internal ignition sensor is showing signs of age and needs to be replaced to ensure the unit continues to light reliably.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

The electrode drift test shows progressed ageing of the control electrode.

From this model's manual
Verified against the Vaillant Ecotec Plus installation & service manual, page 92.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

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

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