BoilerFaultCodesYour boiler is struggling to move water around the system, which is causing it to shut down to prevent overheating.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Problem with the pump circulation
What causes this fault?
This fault occurs when the boiler detects that water is not moving through the heat exchanger quickly enough, leading to a rapid rise in temperature. The most common cause is a seized or failing circulation pump, though it can also be triggered by a build-up of sludge or debris blocking the internal pipework. In some cases, a faulty control board may simply be failing to send power to the pump to start the cycle.
This issue is more frequent in autumn when heating systems are switched back on after being idle all summer, which often causes internal pump components to stick.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 02E — 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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