Does pilot light? (NO) High

Saunier Duval Does pilot light? (NO) Fault Code

Also written as DOESPILOTLIGHTNO — same fault.

The Saunier Duval Does pilot light? (NO) fault code means: your boiler is failing to ignite because the small flame that starts the main burner is not lighting, meaning you currently have no heating or hot water.. It appears on 1 Saunier Duval model 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: Check for pilot jet blockage, incorrect electrode adjustment. If satisfactory replace multi-functional control.
Typical repair cost £150-250 (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 Does pilot light? (NO) fault code

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

Source

Saunier Duval Does pilot light? (NO) 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 7 July 2026