BoilerFaultCodesYour boiler has switched itself off because its internal burner has become too hot to operate safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Burner overheat. Reset as described for code 01.
What causes this fault?
This fault occurs when the water inside the boiler reaches an unsafe temperature, triggering a safety sensor to shut the system down to prevent damage. It is usually caused by a lack of water flow, which often happens if the internal pump has failed or if there is a severe blockage in the main heat exchanger. In some cases, the sensor itself may have developed a fault and is incorrectly reporting that the unit is overheating.
This issue often surfaces when the heating is first turned on after summer, as the internal pump can seize up during long periods of inactivity.
DIY fix possible
Turn the mode selector switch to the 'OFF/RESET' position.Wait for approximately 30 seconds.Turn the switch back to either the 'Hot Water Only' or 'Heating and Hot Water' position.Ensure your radiator valves are open and the system pressure is between 1 and 1.5 bar.
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