How much does it cost to fix Saunier Duval error code 9 E 25?

Typical repair cost for the Saunier Duval 9 E 25 fault is £150-300 including labour.

9 E 25 High

Saunier Duval 9 E 25 Fault Code

Q: What does the Saunier Duval 9 E 25 fault code mean?

Your boiler is overheating too quickly, so it has automatically shut down for ten minutes to protect itself from heat damage.

Also written as 9E25 — same fault.

The Saunier Duval 9 E 25 fault code means: your boiler is overheating too quickly, so it has automatically shut down for ten minutes to protect itself from heat damage.. It appears on 2 Saunier Duval models in our database.

Technical description: If the water temperature inside the boiler increases at greater than 4°C per second, the boiler will stop for 10 minutes. The display will show 9 alternated with E 25.

Typical repair cost £150-300 (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 9 E 25 fault code

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

Source

Saunier Duval 9 E 25 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