BoilerFaultCodesYour boiler has been locked out after the heat safety device tripped because it detected the system was getting too hot.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: All Boilers
What causes this fault?
This fault occurs when the internal temperature of the boiler exceeds safe limits, triggering a safety shut-off to protect the components from damage. The most common reasons include a failing pump that isn't moving water fast enough, a blockage in the heat exchanger, or a buildup of air in the system. Essentially, the heat being generated isn't being carried away from the boiler quickly enough, causing it to overheat.
This issue often surfaces when the heating is first turned on after summer, as the circulation pump can seize or become sluggish during long periods of inactivity.
DIY fix possible
Locate the 'Reset' button on the boiler control panel.Press and hold the Reset button for 5 seconds.Wait for the boiler to restart; if the code persists, call a Gas Safe engineer.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 610 — 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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