I have a Highflow 400BF system.
Recently the pressure has dropped to 1.1 bar, but when I try to top up the guage doesn't register any increase as it use to. Also when heating is on and demand for hot water (shower/washing machine) heating stops. Have changed pump but no change

trevors50uk, January 2010

hi sounds like you have a bit of muck in the the tube where the pressure gauge gose in to, drain the boiler and take out the gauge and clean then add a sluge remover to the system run for a couple of days then drain out and refill see if that helps

wayne the plumb, January 2010