How much does it cost to fix Baxi error code E.04 .54?

Typical repair cost for the Baxi E.04 .54 fault is £250-450 including labour.

E.04 .54 High

Baxi E.04 .54 Fault Code

Q: What does the Baxi E.04 .54 fault code mean?

Your boiler has detected an internal electrical problem with the component that manages the gas supply, so it has safely shut down to prevent unsafe operation.

Also written as E0454 — same fault.

The Baxi E.04 .54 fault code means: your boiler has detected an internal electrical problem with the component that manages the gas supply, so it has safely shut down to prevent unsafe operation.. It appears on 4 Baxi models in our database.

Technical description: Fault in gas valve control circuit

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 .54 fault code

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

Source

Baxi E.04 .54 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 7 July 2026