BoilerFaultCodesYour boiler has shut down because the water inside has become far too hot, which is often caused by a blockage or a pump that isn't moving water around the system properly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Flow temperature exceeded
What causes this fault?
This fault occurs when the water inside the boiler reaches an unsafe temperature because it isn't moving away from the heat source quickly enough. The most common reasons are a failed pump that can no longer circulate the water or a blockage in the system pipes, often caused by a buildup of sludge or debris. In some cases, a faulty sensor may simply be misreading the temperature even if the water is flowing correctly.
This fault is more common in autumn and winter when the heating is first switched on after being idle, as pump components can seize up during the summer months.
DIY fix possible
Check that all radiator valves are fully open to allow water to circulate.Check that your system pressure is between 1.0 and 1.5 bar on the gauge.Restart the boiler by pressing the 'Reset' button for two seconds.
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