BoilerFaultCodesPotterton 110 Fault Code
The Potterton 110 fault code means: your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.. It appears on 1 Potterton model in our database.
Technical description: Overheat thermostat operated or faulty
What causes the Potterton 110 fault?
This fault occurs when the internal temperature of the boiler rises above a safe limit, triggering a safety sensor to cut the power. The most common reasons are a failed pump that isn't moving water away from the heat exchanger quickly enough, or a buildup of limescale and sludge that restricts water flow.
This fault often appears during the first cold spell of autumn when the heating is turned back on after being idle all summer, which can cause internal pump components to seize.
DIY fix possible
Check that your radiator valves are open and not turned to the off position.Ensure your boiler pressure is between 1 and 1.5 bar on the pressure gauge.Press the 'Reset' button (usually a small 'R' or turn the selector knob to 'R' for 5 seconds) to see if the fault clears.
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Gas Safe Register →Potterton models that show the 110 fault code
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Source
Potterton 110 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 27 April 2026