How much does it cost to fix Baxi error code E.04 – .17?

Typical repair cost for the Baxi E.04 – .17 fault is £250-£450 including labour.

E.04 – .17 High

Baxi E.04 – .17 Fault Code

Q: What does the Baxi E.04 – .17 fault code mean?

Your boiler has detected a serious problem with its internal gas system and has shut down as a safety precaution.

Also written as E0417 — same fault.

The Baxi E.04 – .17 fault code means: your boiler has detected a serious problem with its internal gas system and has shut down as a safety precaution.. It appears on 24 Baxi models in our database.

Technical description: Permanent fault. Problem with gas valve or defective gas/air unit.

What causes the Baxi E.04 – .17 fault?

This fault occurs when the boiler's control board detects an electrical or mechanical failure within the internal gas delivery system. The most common reason is a malfunctioning gas valve that can no longer open or close correctly, or a communication error between the valve and the main circuit board. To ensure your safety, the boiler automatically shuts down because it cannot accurately control the flow of fuel to the burner.

Typical repair cost £250-£450 (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 E.04 – .17 fault code

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

Source

Baxi E.04 – .17 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