How much does it cost to fix Saunier Duval error code 01?

Typical repair cost for the Saunier Duval 01 fault is £120-250 including labour.

01 High

Saunier Duval 01 Fault Code

Q: What does the Saunier Duval 01 fault code mean?

Your boiler has failed to light because it is not receiving gas or cannot sense the flame, so it has safely shut itself down to prevent a gas buildup.

The Saunier Duval 01 fault code means: your boiler has failed to light because it is not receiving gas or cannot sense the flame, so it has safely shut itself down to prevent a gas buildup.. It appears on 5 Saunier Duval models in our database.

Technical description: Ignition fault (lockout) caused by no gas, no detection

Typical repair cost £120-250 (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 01 fault code

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

Source

Saunier Duval 01 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