Halstead Ace High Pressure Problems

[amoz]

Hi all

Any advice would be appreciated please - don't know too much about boilers.

I have a Halstead Ace High boiler, at least 6 years old.

The water pressure on the boiler has been problematic in the past few months and now got to the point where I open the water inlet to top up the pressure in the boiler to 2 bar and it drops away almost immediately. This happens even when the heating is on.

Getting lots of noise in rads when heating kicks in, water gushing through pipes into rads etc. Bleed the rads yesterday and some air came out berore water, which was a bit merky but not black.

Boiler itself is making lots of noises, sounds like it is boiling water or steaming inside the boiler. Then also get suction noises in the boiler randomly.

had british gas out 2-3 times in past 18 months, want to understand for myself whats happening and wheather the boiler is on it's way out.

Also, have low water pressure in general from the mains, would this affect the problem?

Any thoughts would be helpful thanks

 

[MANDATE]

Firstly you should only set the cold pressure to 1bar. not 2.
When heating is on it should rise to about 2bar.
What I suspect is happening, is that over time the expansion vessel has lost some of its 'air' pre charge.
This means the volume of air is lower than it should be.
The rule is when the volume of air is halved the pressure is doubled.
So instead of going from 1bar to 2bar it goes from 1bar to 4bar, well it would except for the Pressure Relief Valve which is set to 3bar.
Best to search for 'expansion vessel' on this forum or read some of my recent posts on this subject.