Does main burner light? (NO) High

Saunier Duval Does main burner light? (NO) Fault Code

Also written as DOESMAINBURNERLIGHTNO — same fault.

The Saunier Duval Does main burner light? (NO) fault code means: your boiler is failing to ignite because it is not receiving the necessary electrical signal to release the gas required for the flame.. 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: Is there 230V~ between main multi-functional control solenoid black and blue cables? If NO, isolate supply, test harness and replace as required. If YES, replace multi-functional control.
Typical repair cost £180-350 (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 main burner light? (NO) fault code

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

Source

Saunier Duval Does main burner 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