I have a Puma 80e bolier and recently the pressure keeps dropping down to nothing therefore I have no heating or hot water until I open a tap and increase the pressure to around 1.5 to 2. On doing this water starts to drip outside the house from a small pipe. There is also a slight drip I have noticed coming from the DOM HW OUTLET. Can you advise.

MRS DIANE JAMIESON, September 2007

this sounds like an expansion problem,either the braided expansion hose or tee is blocked,or more likely the expansion vessel has lost its charge of air,all of which or a combination of all will cause water to discharge outside when the boiler runs. this is probably a job which is beyond a diy repair, but can be repaired pretty easily,and may also reuire the replacement of the 3bar blowoff valve if it will not reseat. as for the dhw dripping,this is another problem which needs attention,but would not cause the boiler to lose pressure, and you need to be sure this is where it is actually dripping from.

alan wilkinson, September 2007

I have exactly the same problem with a potterton ultra 2. did you get a reply. I would like to know what the cause is.
John.

John Hamill, September 2007