How much does it cost to fix Baxi error code E154?

Typical repair cost for the Baxi E154 fault is £150-350 including labour.

E154 High

Baxi E154 Fault Code

Q: What does the Baxi E154 fault code mean?

Your boiler has detected that the water is circulating or heating up incorrectly, likely due to a pump issue or a blockage.

The Baxi E154 fault code means: your boiler has detected that the water is circulating or heating up incorrectly, likely due to a pump issue or a blockage.. It appears on 24 Baxi models in our database.

Technical description: Flow/return sensor temperature test.

What causes the Baxi E154 fault?

This fault occurs when the boiler's internal sensors detect that water is not moving through the system quickly enough to carry heat away from the burner. The most common reason is a failing circulation pump or a blockage within the heat exchanger caused by a buildup of sludge and debris. Essentially, the boiler is shutting down to prevent itself from overheating because the water has become trapped and is heating up too fast.

This issue often comes to light during the first cold snap of autumn when the heating is turned on after being stagnant all summer, causing internal pump parts to seize.

Typical repair cost £150-350 (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 E154 fault code

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

Source

Baxi E154 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