BoilerFaultCodesYour boiler has switched itself off because it has reached an unsafe temperature and needs to cool down before it can be used again.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Burner fault: Temperature limiter has responded
What causes this fault?
This fault occurs when the water inside the boiler gets too hot, causing a safety sensor to trip and shut the system down to prevent damage. The most common reasons are a pump failure that stops water from moving around the system or a build-up of debris and limescale that blocks the internal pipework.
This fault is more common in autumn and winter when the heating is first turned on after a long summer break, as internal pumps can sometimes seize up from lack of use.
DIY fix possible
Wait 30 minutes for the boiler to cool downCheck that your radiator valves are open to allow water to flowPress the 'Reset' button on the boiler control panel
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 d2 — 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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