WHEN USEING HOT WATER ON MY COMBI THE GUAGE PRESSURE DROPS AND WHILE IT IS RUNNING I HAVE TO FILL THE BOILER UP TO THE RIGHT PRESSURE 1.5 IM AFRAID IF I DONT IT MAY DO SERIOUS DAMAGE THIS ONLY HAPPENS WHEN RUNNING A BATH PROLONGED USE WHEN USEING CH NO PRESSURE LOSS ANYONE HELP

XPSDEN, February 2010

i have sorted problem myself after trying most things it turned out to be pressure relief valve only when pressure built up to max did it start to drip when i say max i mean running temp on my boiler,i hope it will help someone else if they have the same prob XPSDEN.

denis, February 2010