Your boiler has detected that the internal mechanism responsible for circulating water around your radiators and taps is not operating correctly.

Pump Fault

What causes this fault?

This fault occurs when the boiler detects that water is not moving through the internal pipes quickly enough to take the heat away from the burner. The most common reasons are a failed pump that can no longer push the water, or a blockage caused by a build-up of sludge and debris in the system. Because the heat cannot escape, the boiler shuts down as a safety precaution to prevent the internal components from melting or cracking.