i have a greenstar 30cdi system boiler. Pressure gauge has slipped to less than 0.5 bar and radiators upstairs are only heating up at bottom. Have info about turning white key to lock and then turning white screw to adjust pressure. Only question is, when I do this water starts to trickle out...
Thanks for above. 1 small question. When I follow above instructions and turn white screw water begins to trickle out where white key is inserted. Is this meant to happen ? Was wary of continuing just in case it shouldn't. Thanks