How much does it cost to fix Saunier Duval error code 2 9?

Typical repair cost for the Saunier Duval 2 9 fault is £180-350 including labour.

2 9 High

Saunier Duval 2 9 Fault Code

Q: What does the Saunier Duval 2 9 fault code mean?

Your boiler has detected that the internal mechanism responsible for safely venting exhaust gases has stopped working, so it has shut down to keep your home safe.

Also written as 29 — same fault.

The Saunier Duval 2 9 fault code means: your boiler has detected that the internal mechanism responsible for safely venting exhaust gases has stopped working, so it has shut down to keep your home safe.. It appears on 2 Saunier Duval models in our database.

Technical description: The fan is stationary and open circuit.

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 2 9 fault code

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

Source

Saunier Duval 2 9 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