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poor hot water pressure?

hope someone can help ive got an ariston euro combi boiler the problem is when you open hot tap boiler does not fire up heating ok i also have poor hot water pressure is that the problem that the boiler wont fire up and any suggestions what couses this thanks
kev, March 2012
cheers sd

kev, March 2012
As you have low HW pressure, I would think that the heat exchanger for HW is restricted, possibly scaled up. I do not know your unit, Depends on how thing work, might need to remove to clean, or replace. You may get other replies, if not hope this helps.

SD, March 2012
link Click here to see other fixes for Ariston.