BoilerFaultCodesTechnical description
Pump run/pressure sensor fault
What causes this fault?
This fault occurs when the boiler's internal computer fails to detect a small surge in water pressure that should happen the moment the pump starts spinning. The most common reason is that the pressure sensor has become blocked with sludge or the pump itself has seized, meaning the system cannot confirm it is safe to ignite.
This issue is more frequent in autumn when the heating is turned on for the first time after summer, as pumps often seize during long periods of inactivity.
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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