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is this the part number for the exchanger or the seals, as ive found two heat exchangers with numbers either side of this?

yep afraid so, even when the boiler is completly off, and the amount of water ive bleed from the radiators to bring it down would fill the system several times

best places to get a heat exchanger? ive found online plumbing supplies are they any good?

is this the only way of fixing it? as i can see the exchanger at the back. Do you mean that it is blocked? and thats where the preasure is coming from?

Hello all, my boiler named above is constantly over pressureing and hence bleeding outside down the wall. At first i thought maybe it was due to the manual top up valve leaking so i have replaced and the problem continues. I have read on here that there is a pressure unit onboard but upon...