BoilerFaultCodesYour boiler has stopped working because the internal pump that moves hot water around your pipes has developed an electrical fault or has failed.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Pump Fault: Check pump wiring, if OK replace pump
What causes this fault?
This fault occurs when the boiler's main internal unit detects that the pump is no longer spinning or has an electrical connection failure. The most common reason is that the motor inside the pump has burnt out or become seized after years of pushing water through the system. In some cases, it can also be caused by a loose wiring connection or a leak dripping onto the pump's electrical terminals.
This issue is frequently seen at the start of autumn when a pump that has been idle all summer is suddenly asked to work and fails to restart.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A boiler cover plan would cover faults like F15 — no call-out fees, no surprises.
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Could it be time for a new boiler?
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