BoilerFaultCodesTechnical description
Error with pressure – no pressure change detection when starting the pump
What causes this fault?
This fault occurs when the boiler's internal sensor fails to detect a slight jump in water pressure that should happen when the pump starts spinning. The most common reason is that the sensor itself is blocked with debris or has failed, but it can also be caused by a failing pump or a loss of air pressure in the expansion vessel. Essentially, the boiler shuts down because it cannot confirm that water is safely circulating through the system.
This fault is more frequent in autumn when the heating is turned back on after a long summer break, as pumps and sensors are more likely to seize or stick after 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.