My boiler's working fine, hot water, radiators all working normally, but I noticed the pressure gauge was getting low and went to add some water from the mains via the filling loop. This is just two taps - heating system on one side and mains on the other. Between the taps there's a short flexible pipe with braiding.
This has always worked fine in the past. You open each tap in turn, hear the mains water rushing through the pipe and then close both taps again. Pressure goes up and all's well for another several months.
But no joy now. I open both taps and there's no flow at all. Pressure remains where it was. Any ideas about how to fix this? And what eventually happens if I just keep running the system without being able to top up the pressure?
Any help gratefully received. Cheers.