BoilerFaultCodesYour boiler has sensed that the water inside is getting much hotter than it should be and has shut down as a safety precaution.
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 too high
What causes this fault?
This fault occurs when the water leaving the boiler exceeds its safe temperature limit, causing the system to shut down to prevent damage. The most common reason is a lack of water flow, often caused by a failing internal pump or a blockage in the pipes that stops heat from being carried away from the burner. It can also happen if a sensor fails and incorrectly reports that the water is overheating.
This fault is more frequent during the first cold spell of autumn when heating systems are turned on after months of inactivity, which can cause internal pumps to seize.
DIY fix possible
Ensure all radiator valves (TRVs) are turned to the highest settingCheck that the boiler pressure gauge is between 1 and 1.5 barReset the boiler using the display panel to see if the fault clears
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