BoilerFaultCodesYour boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Overheat
What causes this fault?
This fault occurs when the water inside the boiler exceeds a safe temperature, triggering a safety sensor to cut the power. The most common reasons are a pump failure that stops water from moving or a blockage within the main heat exchanger that prevents heat from transferring correctly. It can also be caused by air trapped in the system or a faulty sensor providing an incorrect reading.
This fault is frequently seen at the start of autumn when heating systems are switched back on after being idle, as circulation pumps can become seized over the summer.
DIY fix possible
Check that your radiator valves are open and not turned to zeroEnsure there is enough water pressure in the system (typically between 1 and 1.5 bar)Press the reset button to see if the fault clears
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 LA/HA — no call-out fees, no surprises.
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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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