110 High

Baxi 110 Fault Code

The Baxi 110 fault code means: your boiler has switched itself off because it has reached too high a temperature, likely due to trapped air or a blockage stopping water from circulating.. It appears on 26 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Overheated – try bleeding your radiators

What causes the Baxi 110 fault?

This fault occurs when the water inside your boiler becomes too hot, causing a safety sensor to trip and shut the system down to prevent damage. The most common reason is that the water cannot move around the system properly, often due to an airlock in the pipework or a pump that has failed. It can also happen if your radiator valves are all closed or if there is a physical blockage restricting the flow.

This fault is frequently seen in autumn when heating systems are turned back on after a long summer break, as pump components can seize up from lack of use.

Typical repair cost £100-250 (including labour)

DIY fix possible

Turn off the boiler and allow it to cool down completely.Use a radiator key to bleed all radiators to remove any trapped air.Check the boiler pressure gauge and top it up to 1.5 bar if it has dropped.Turn the boiler back on and press the 'Reset' button.

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Baxi models that show the 110 fault code

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

Source

Baxi 110 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