i have a biasi garda he condensing boiler and in the last few days it has started to overflow from the outlet pipe. i have checked the boiler out completely and everything works fine, just cant figure out how to stop it from overflowing.does anyone know how to do this and help me,would be very grateful for any help, thanks......

jag, March 2012

if continue leaking valve, is pressure droping and if not than filling loop is open, so close it, remove flex pipe and see fill tap is not leaking, if still than plate heatexchanger is leaking within than close cold to boiler and see if stops than figure out what

k, March 2012

Change pressure relief valve just flow pipe which overflow,if you are not familiar with doing it you need plumber,you have to drain system to change it

ltd, March 2012