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how can i fix repeated low pressure of my puma 80 boiler?

I noticed a few weeks ago when i woke up that the boiler was shining 'low system pressure' so i topped it up and the heating worked fine. a week later heating and hot water was stopping again with the same problem. i can easily top it up but would like to know how to fix the problem because there is obviously a leak but i cant find one in the house?
Lisa Thomas, March 2006
check out side poss pressure realease valve is passing.if no leaks are apparent try adding a leak sealer to one of your radiators. u can buy it from b and q.

paul, March 2006