Boiler pressure creeping up

[trevorbayliss]

I had a hidden leak on my system beginning of this year. So added leak sealer.

Then a rad started leaking recently from its main body. So I binned this rad and replaced with a new one. I assume this was where the hidden leak was all along.

I now want to clean my system so two weeks ago I added x400 and have been running the heating a few times a week. I am planning on leaving it in for another week to try get any rubbish out.

Have emptied the pro 2 mag clean and it has a little crud but not loads.

But my pressure is now going up. It was running at 2.9 the other day while on. So I drained 1/3 bucket out and it went down to 1.8 bar (not on).

today it is up at 2 bar (not on).

Any idea what is happening?

Has the leak sealer gunked up the boiler?

 

[DP]

Has the leak sealer gunked up the boiler?

Should not have.
Boiler serviced as per the manual?

 

[cross thread]

Stat by having the expansion vessel pressure checked

 

[tincup]

Check the filling loop is properly closed.

 

[old duffer]

only water will increase the pressure inside the closed system so if its going up then water is getting in. Pressure and flow are not the same so even a small amount of water can increase the pressure

 

[trevorbayliss]

Yes serviced and a new EV done this jan as we weren’t sure if the leak was this. So I decided to put a new one in to cross it off list of possibilities.

Ok I don’t think water is getting in. Will see how I get on after the clean out is finished.