BoilerFaultCodesYour boiler's internal pump has stopped moving water around the system, which means your heating and hot water will not work.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Pump failure
What causes this fault?
This fault occurs when the boiler's internal pump can no longer push water through your radiators or hot water cylinder. The most common reasons are the pump motor seizing up due to age, or a buildup of black sludge and debris from inside your heating system getting stuck in the moving parts.
This issue is most frequent in autumn when the heating is turned back on for the first time, as the pump can seize up after sitting idle during the summer months.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like Test2 — no call-out fees, no surprises.
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