Hi! I have the above boiler and the pressure drops from 1.5 to 0.3 bar in a day. The " dump valve" is leaking and creates a puddle outside. Prior to this I had a couple of drops a week appearing from underneath the boiler somewhere.
Is this something easily fixed, How do I do it and is there something else I need to be concerned about?
either the pressure relief valve or "dump valve" as you called it is passing or the expansion vessel on the back of the boiler is flat and needs pumping up./ open the pressure relief valve, and use a foot pump the pump up the expansion vessel on the back of the boiler. its the big red disc on the backl opf the boiler.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.