How much does it cost to fix Baxi error code E09?

Typical repair cost for the Baxi E09 fault is £120-280 including labour.

E09 High

Baxi E09 Fault Code

Q: What does the Baxi E09 fault code mean?

Your boiler has lost its connection to the gas valve, meaning it cannot ignite safely and has stopped providing heating or hot water.

The Baxi E09 fault code means: your boiler has lost its connection to the gas valve, meaning it cannot ignite safely and has stopped providing heating or hot water.. It appears on 24 Baxi models in our database.

Technical description: Gas valve connection cable.

What causes the Baxi E09 fault?

This fault occurs when the boiler's central brain loses communication with the gas valve, which is the component responsible for letting fuel into the burner. The most common reason is a loose or damaged connection cable, but it can also be triggered by a electronic failure within the gas valve itself or the main circuit board. Without this vital connection, the boiler cannot safely ignite and will shut down immediately to prevent any risks.

Typical repair cost £120-280 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Baxi models that show the E09 fault code

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

Source

Baxi E09 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

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