BoilerFaultCodesYour boiler has switched itself off because it has detected that it is getting too hot inside.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Shut down the boiler in the event of the system, the boiler or the flue overheating.
What causes this fault?
This fault occurs when the water inside the boiler reaches an unsafe temperature, triggering a safety switch to prevent damage. The most common reasons are a pump failure that stops water from moving or a blockage in the pipework that restricts flow. In some cases, the safety sensor itself may have become faulty and is reporting a high temperature incorrectly.
This issue often appears when the heating is first turned on after summer, as the internal pump can seize up during long periods of inactivity.
DIY fix possible
Check that all radiator valves are open and not blockedTurn the selector switch to the 'Reset' position and hold for at least five secondsEnsure the system pressure is between 1 and 1.5 bar on the pressure gauge
Find a Gas Safe engineer
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Gas Safe Register →Protect yourself from future repair bills
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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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