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thx tony will try to clean it out i might check out the differetial pressure sense for sludge

alpha boiler 240x - Intermittent Hot Water the last few weeks we've started getting problems with intermitten hot water supply from our boiler the hot water runs luke warm then cold then luke warm if i slow the flow down it gets very warm the cold i ve checked flow switches and diaphams...

i fixed the promblem with a piece of duct tape on micro switch closing the gap by 0.5mm it does the job

i was told last year to blow down the pressure tubes, i did it and great everything worked. how same promblem did the same and works BUT only last's a few hours then i have to do it again repeating everytime i need hot water(the heating also works but i have't left it on) any ideas ? the...