Your boiler has detected low water pressure and is automatically running a seven-minute process to remove trapped air from the system before it resumes normal operation.

DIY fix possible

Wait 7 minutes for the automatic de-aeration program to complete.Check the pressure gauge on the front of the boiler once the program has finished.If the pressure is below 1.0 bar, use the filling loop underneath the boiler to Top up the system to between 1.0 and 1.5 bar.