BoilerFaultCodesVaillant I.144 Fault Code
Also written as I144 — same fault.
The Vaillant I.144 fault code means: your boiler's internal sensor that checks for safe burning is showing signs of age and needs to be replaced to ensure the unit continues to operate safely and efficiently.. It appears on 3 Vaillant models in our database.
Technical description: The drift test electrode has reached the maximum permissible value. The electrode drift test shows progressed ageing of the control electrode.
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 7 July 2026