How much does it cost to fix Saunier Duval error code 9 E 30?

Typical repair cost for the Saunier Duval 9 E 30 fault is £120-£250 including labour.

9 E 30 Medium

Saunier Duval 9 E 30 Fault Code

Q: What does the Saunier Duval 9 E 30 fault code mean?

Your boiler has temporarily paused because it has detected a large temperature difference between the water leaving the boiler and the water returning to it, suggesting a blockage or poor circulation.

Also written as 9E30 — same fault.

The Saunier Duval 9 E 30 fault code means: your boiler has temporarily paused because it has detected a large temperature difference between the water leaving the boiler and the water returning to it, suggesting a blockage or poor circulation.. It appears on 2 Saunier Duval models in our database.

Technical description: If the temperature difference between the central heating flow and return pipes exceeds 40°C, the boiler will stop for 2,5 minutes. The display will show 9 alternated with E 30.

Typical repair cost £120-£250 (including labour)

DIY fix possible

Check that all radiator valves throughout your home are fully open.Ensure your central heating system pressure is set correctly in line with your user manual.Check for any blockages or trapped air by bleeding your radiators.

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Saunier Duval models that show the 9 E 30 fault code

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

Source

Saunier Duval 9 E 30 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