00. Emergency

Saunier Duval 00. Fault Code

Also written as 00 — same fault.

The Saunier Duval 00. fault code means: your boiler has detected a signal suggesting a flame is burning when it shouldn't be, which has caused it to shut down for safety reasons.. It appears on 4 Saunier Duval models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: There is a flame signal without there being a flame present.
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 00. fault code

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

Source

Saunier Duval 00. 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