BoilerFaultCodesYour boiler has shut down because it has detected it is getting too hot, usually due to a lack of water circulation or a blockage in the system.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: OVERHEAT ERROR
What causes this fault?
This fault occurs when the water inside the boiler exceeds a safe temperature limit, causing the safety sensors to shut the system down to prevent damage. The most common reasons are a failed internal pump that isn't moving the water away fast enough or a buildup of sludge and debris creating a blockage in the heat exchanger.
This issue often appears when the heating is first turned on after summer, as pump components can seize up after months of inactivity.
DIY fix possible
Check that your boiler pressure is between 1 and 1.5 bar on the pressure gaugeEnsure all radiator valves are fully open and not turned offCheck if any bypass valves are closed and try resetting the boiler once cooled
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