BoilerFaultCodesYour boiler has become too hot and has shut itself down for safety, likely because the water isn't moving through the system correctly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Boiler overheat tripped
What causes this fault?
This fault occurs when the water inside the boiler exceeds a safe temperature limit, triggering a safety sensor to cut the power. The most common reason is that the internal pump has failed or seized, meaning the heat generated by the burner cannot be carried away to your radiators. It can also be caused by a blockage in the pipework or a build-up of air preventing the water from circulating properly.
This fault is frequently seen in autumn when heating systems are turned back on after being idle all summer, which can cause the internal pump to stick or seize.
DIY fix possible
Check that your radiator valves are open to allow water to flow.Check the boiler pressure gauge and top up to 1.5 bar if it is too low.Press the Reset button once to see if the system restarts.
Find a Gas Safe engineer
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Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like E110 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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