potterton Apollo 25 issues

[plumbbobshan]

Evening lads and lasses ,
My mate has a Potterton Apollo ,with the following symptom :-
Run hot water all day long, put the heating on and it blows off at 2.8 bar .
When its cold the pressure sits at 1.2bar .
Have replaced the expansion vessel as it was found to be bust.
Replaced the PRV as it was passing .
Checked the pressure in the new expansion vessel and set it to 1bar as the label states . Put the heating on and it blows off .
Installed in a small bungalow with 5 rads .
any ideas ????
thanks in anticipation.

 

[ShaunCorbs]

The hose supplying the expansion vessel isn't blocked is it ?

 

[Harvest Fields]

The hose supplying the expansion vessel isn't blocked is it ?

It shouldn’t be on a flexi for this reason if it is blocked

 

[plumbbobshan]

The hose supplying the expansion vessel isn't blocked is it ?

good call , I haven't checked it but I will do at the next call .

 

[Harvest Fields]

Hate external vessels on flexi connectors. Just fit the thing properly

 

[plumbbobshan]

It shouldn’t be on a flexi for this reason if it is blocked

it is a short Flexi pipe fitted by the Manu to all the plastic parts , easy to work on and check .

 

[plumbbobshan]

Thanks for the advice Shauncorbs the small flexi house was blocked, I unblocked it with some stuff wire and the boiler is running smooth again