Pressure increases when heating on?

Pressure vessel is faulty, Might be a cheaper option to fit an independent vessel on the system rather than trying to change the vessel on the boiler.

Cozzie
February 2010

Mav
Thanks for the prompt reply.
I performed the test you mentioned. - by pressing the pin on the valve of pressure vessel only air comes out no water. My Boiler is Ariston Erocombi Sx20.
Please help. thanks

abs
March 2009

the diaphram in the pressure vessel has gone
so pressure vessel need replacing

to test if this is the case there is a valve on the pressure vessel like on a car tyre when you press on the valve no water should come out just air
but i suspect you will get water

mav
March 2009