rising pressure problem

[neil m]

hello all
i have a worcester28si 11 and the pressure seems to be rising slowly,at first it would drop back down to under 2 bar but now its not going under 2.5,it rises a little when the heating is on but never above 3 bar,i have a plumber coming at the weekend to have a look, is the heating safe to use? two young kids in the house and with this cold spell the house is like a fridge
thanks in advance

 

[gas4you]

If it goes above 3 bar the safety valve will open and let the excess pressure out

Worcesters usually have a built in filling link, but if yours has a filling loop under it check that both valves at each end are fully turned off

 

[meldrew's_mate]

It could also be the Domestic Hot Water heat exchanger at fault, leaking mains pressure cold water into the heating side.

If so a new DHW heat exchanger is required, plus some seals.
Don't let a plumber touch it unless he/she carries (and shows you!) a valid CORGI card.

 

[neil m]

thank you,the kids will be chuffed
hopefully the plumber will sort it at the weekend,he`s corgi registered
regards