How much does it cost to fix Main error code E9?

Typical repair cost for the Main E9 fault is £100-£250 including labour.

E9 High

Main E9 Fault Code

Q: What does the Main E9 fault code mean?

Your boiler has become too hot and has automatically shut down as a safety precaution to prevent damage.

The Main E9 fault code means: your boiler has become too hot and has automatically shut down as a safety precaution to prevent damage.. It appears on 1 Main model in our database.

Technical description: Overheat thermostat tripped (Limit stat)

Typical repair cost £100-£250 (including labour)

DIY fix possible

Turn the boiler off and allow it to cool down for at least 20 minutesCheck that all radiator valves and internal stopcocks are fully openTurn the selector switch to the reset position for five seconds, then back to the desired mode

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Main models that show the E9 fault code

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

Multipoint FF 3 Repair: £100-£250

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026