How much does it cost to fix British Gas error code E9?

Typical repair cost for the British Gas E9 fault is £90-280 including labour.

E9 High

British Gas E9 Fault Code

Q: What does the British Gas E9 fault code mean?

Your boiler has switched itself off because it has become too hot internally, usually due to a lack of water flow or a circulation problem.

The British Gas E9 fault code means: your boiler has switched itself off because it has become too hot internally, usually due to a lack of water flow or a circulation problem.. It appears on 1 British Gas model in our database.

Technical description: Safety temperature limiter has tripped

Typical repair cost £90-280 (including labour)

DIY fix possible

Check if your radiator valves are open to allow water to flow.Check your boiler pressure gauge and top it up to 1.5 bar if it is too low.Press the reset button on the front of the boiler.

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British Gas models that show the E9 fault code

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

RD 430i Repair: £90-280

Source

British Gas E9 fault code information on this page is sourced and cross-checked against the official British Gas service / installation manuals for each affected model.

British Gas RD 430i manual (PDF)

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026