BoilerFaultCodesYour boiler has got too hot and has automatically shut down to prevent damage to the internal components.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Overheat thermostat operated or faulty.
What causes this fault?
This fault occurs when the water inside the boiler reaches an unsafe temperature, triggering a safety sensor to shut the system down. The most common reasons are a pump failure preventing water from moving away from the burner or a blockage caused by internal limescale and sludge.
This issue often appears when the heating is first switched on in autumn, as the internal pump can seize up after being inactive during the summer months.
DIY fix possible
Wait at least 20 minutes for the boiler to cool down completely.Check that your radiator valves are open and not blocked by furniture.Select the 'Reset' position on the control knob for five seconds to restart the system.
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 E02 — no call-out fees, no surprises.
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Potterton Gold HE is discontinued — time for a new one?
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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