How can I fix my Worcester Highflow 400 RSF no hot water or heating?

Without a pressure reading the boiler will cut out.
Put the pressure up to 1 to 1 / 1/2 bar on the boiler through the filling loop.
Vent all radiators. and turn on.
Making sure the pressure gauge on the boiler is at 1 to 1 and a half bar reading when the system is full.
If the sealed combi system is low in pressure it will not work due low pressuure. Nothing wrong, it`s a safety system.

Neil.Plumbing.
May 2008

pressure needs to be 1-1.5 bar to operate, bigger question is why did the pressure drop!!

T
May 2008