had to renew a leaking diverter valve on a vaillant ecotec boiler, everthing works fine (heating and hot water) but now the expansion keeps dripping and have to keep topping up the water pressure. help.
if u dumped pressure to change valve through pressure relief valve, there will be muck in it, and it wont have seated properly. either open it a few times or replace it for less than a tenner
