How much does it cost to fix Baxi error code E15?

Typical repair cost for the Baxi E15 fault is £180-350 including labour.

E15 High

Baxi E15 Fault Code

Q: What does the Baxi E15 fault code mean?

Your boiler has detected an internal communication error with the part that controls the gas supply, meaning it cannot ignite safely to provide heat or hot water.

The Baxi E15 fault code means: your boiler has detected an internal communication error with the part that controls the gas supply, meaning it cannot ignite safely to provide heat or hot water.. It appears on 24 Baxi models in our database.

Technical description: Gas valve command fault.

What causes the Baxi E15 fault?

This fault occurs when the boiler's main control board loses the ability to properly communicate with the gas valve that regulates fuel flow. It is typically caused by a loose internal connection, a failing circuit board, or a mechanical breakdown within the gas valve itself, preventing the system from safely releasing gas for ignition.

Typical repair cost £180-350 (including labour)

Engineer required

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

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Baxi models that show the E15 fault code

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

Source

Baxi E15 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