BoilerFaultCodesTechnical description
Fault on Pump or Low System Pressure
What causes this fault?
This fault occurs when the boiler detects that water isn't moving through the heat exchanger fast enough to safely carry heat away. The most common reason is that the system pressure has dropped too low for the pump to work, or the pump itself has seized after a period of inactivity.
This issue is frequently seen in autumn when the heating is turned on for the first time after summer, as the internal pump can often become stuck during the warmer months.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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