E110 High

Potterton E110 Fault Code

The Potterton E110 fault code means: your boiler has likely overheated, causing a safety switch to trip and shut the system down to protect itself.. It appears on 12 Potterton 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: Safety Thermostat Operated

What causes the Potterton E110 fault?

This fault occurs when the water temperature inside your boiler gets too high, triggering a safety switch to prevent damage. The most common reason is a lack of water flow, often caused by a failing pump or a blockage within the main heat exchanger. It can also happen if there is trapped air in the system or if the internal safety sensor itself has developed a fault.

Typical repair cost £100-280 (including labour)

DIY fix possible

Check that your radiator valves are open and not turned to the off position.Ensure there are no blockages in the system such as trapped air by venting (bleeding) your radiators.Wait for the boiler to cool down and press the 'Reset' button.

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Potterton models that show the E110 fault code

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

Source

Potterton E110 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026