Once a week I have to use the tap on the boiler to build up the pressure til the gauge goes from 0 - 1 bar.
if I go higher than 1 bar. say to 2bar then the overflow pipe
on the boiler sprays out water when the heating comes on.

There does not appear to be a leak in any of the raidators

What would cause this problem?
Boiler is. Ferroli. Model.Modena 80E

Anthony Moore, December 2007

bad check valve in supply pipe.replace and bleed all air from rads. b fine.

ck, December 2007