When the boiler looses pressure it stops working when I repressurise the system it starts to work normally again but only stays on as long as there is some pressure. This is now happenning on a daily basis.
I have had the expansion vessel and condensate and overflow checked and have added ferrinox to the system and the pressure still keeps going.There are no visible leaks anywhere in the house. Any ideas would be gratefully accepted.

John Mo, February 2011

put a plstic bag on the blow off pipe,that is the copper pipe that go's from the boiler outside,NOT the plastic pipe,put elasti band to hold it,if there is any water in the bag next day have the blow off valve changed,not an expencive job.

keith,, February 2011