44. High

Saunier Duval 44. Fault Code

Also written as 44 — same fault.

The Saunier Duval 44. fault code means: your boiler's internal computer has encountered a serious error and is unable to operate safely, meaning your heating and hot water will not work.. It appears on 2 Saunier Duval models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Internal fault in the Automatic Control Module.
Typical repair cost £250-450 (including labour)

Engineer required

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

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Saunier Duval models that show the 44. fault code

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

Source

Saunier Duval 44. fault code information on this page is sourced and cross-checked against the official Saunier Duval service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026