BoilerFaultCodesPotterton E02 Fault Code
The Potterton E02 fault code means: your boiler has safety-tripped because it has detected an overheating issue within the internal system.. It appears on 6 Potterton models in our database.
Technical description: Burner & Fault Indicator Neon
What causes the Potterton E02 fault?
This fault occurs when the internal water temperature exceeds a safe limit, causing the overheat thermostat to shut the system down to prevent damage. The most common reasons are a pump failure that stops water from moving or a blockage within the main heat exchanger that restricts flow. It can also be triggered by trapped air in the pipework or a faulty sensor providing an incorrect temperature reading.
This fault is more common in autumn when heating systems are first turned on after being idle all summer, as stagnant water can cause the pump to seize or stick.
DIY fix possible
Check that your home's radiator valves are fully open.Ensure there is enough water pressure in the system (typically between 1 and 1.5 bar).Turn the control knob to the 'Reset' position, hold for five seconds, and release.
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Gas Safe Register →Potterton models that show the E02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton E02 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