How much does it cost to fix Baxi error code E54?

Typical repair cost for the Baxi E54 fault is £120-210 including labour.

E54 Medium

Baxi E54 Fault Code

Q: What does the Baxi E54 fault code mean?

The boiler is struggling to detect when you turn on a hot tap, which may result in lukewarm water or no hot water at all.

The Baxi E54 fault code means: the boiler is struggling to detect when you turn on a hot tap, which may result in lukewarm water or no hot water at all.. It appears on 26 Baxi models in our database.

Technical description: Domestic hot water (DHW) flow sensor fault

What causes the Baxi E54 fault?

This fault occurs when the internal sensor responsible for monitoring water movement fails to tell the boiler that you have opened a tap. The most common reason is that the small internal turbine has become jammed with limescale or debris, preventing it from spinning and sending a signal. In some cases, the electrical connections between this sensor and the main control board may have become loose or damaged.

Typical repair cost £120-210 (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 E54 fault code

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

Source

Baxi E54 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