I.144 Medium

Vaillant I.144 Fault Code

Also written as I144 — same fault.

The Vaillant I.144 fault code means: your boiler's flame sensor is showing signs of wear and age, meaning it may soon struggle to reliably detect the flame to keep the burner running.. It appears on 4 Vaillant models in our database.

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.

Technical description: The drift test electrode has reached the maximum permissible value. The electrode drift test shows progressed ageing of the control electrode.
Typical repair cost £120-200 (including labour)

Engineer required

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

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Vaillant models that show the I.144 fault code

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

Source

Vaillant I.144 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 31 August 2026