BoilerFaultCodesYour boiler has stopped working because it has gotten too hot or the water is not circulating 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: Flow/return valves closed, Stuck pump, or the boiler has overheated.
What causes this fault?
This fault occurs when the internal temperature of the boiler rises too quickly or exceeds a safe limit, triggering a safety shut-off. It is usually caused by a physical blockage in the pipework, a mechanical failure of the pump, or air trapped within the heat exchanger that prevents heat from being carried away. Essentially, the water is not moving through the boiler fast enough to keep it cool.
This issue often surfaces when the heating is turned back on for the first time in autumn, as the pump can seize up after sitting idle during the summer months.
DIY fix possible
Wait for the boiler to cool down for at least 30 minutes.Check that all radiator valves and the flow/return valves under the boiler are fully open.Press the 'Reset' button on the front control panel to restart the unit.
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A boiler cover plan would cover faults like 02 — 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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