How much does it cost to fix Baxi error code E1?

Typical repair cost for the Baxi E1 fault is £80-250 including labour.

E1 High

Baxi E1 Fault Code

Q: What does the Baxi E1 fault code mean?

Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.

The Baxi E1 fault code means: your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.. It appears on 23 Baxi models in our database.

Technical description: Overheated – try bleeding your radiators

What causes the Baxi E1 fault?

This fault occurs when the water inside the boiler reaches an unsafe temperature, triggering a safety sensor to cut the power. The most common reasons are a lack of water flow caused by a failing pump, a blockage in the system, or air trapped within the pipework. Essentially, the heat cannot be moved away from the boiler quickly enough, causing it to overheat.

This fault is often seen in autumn when heating systems are turned on for the first time after summer, as pump components can seize up during long periods of inactivity.

Typical repair cost £80-250 (including labour)

DIY fix possible

Check that your boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves and the boiler isolation valves are fully openBleed your radiators to remove trapped air that might be blocking water flow

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Source

Baxi E1 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