BoilerFaultCodesYour boiler's internal pump is unable to move water because it is jammed or contains trapped air, stopping your heating from working.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Pump stuck or running in air
What causes this fault?
This fault occurs when the boiler's internal pump is unable to circulate water through the system, usually because the pump has physically seized during a period of inactivity. It can also be triggered if air pockets are trapped inside the pump head, preventing it from creating the necessary pressure to move water around your radiators.
This issue is particularly common in autumn when homeowners turn their heating back on for the first time after the pump has sat stationary all summer.
DIY fix possible
Check that your radiator valves are openEnsure the boiler pressure is between 1 and 1.5 bar on the front displayGently bleed your radiators to remove any trapped airReset the boiler to see if the pump clears the blockage
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A boiler cover plan would cover faults like 281 — 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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