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It's definately not the microswitch that is faulty. The Boiler definately does go into DHW mode (as proven by the sequence of LED's on the panel) and also proven by the fact that when the CH is running, the activation of the switch turns the flames off. And I'm getting continuity on the switch...

when you say the system flow switch do you mean the microswitch which is activated by the plunger (which depresses when a hot water tap is opened), then yes I have checked it with a meter. There is another switch which is a pressure switch mounted on the side of one of the pipes. I'm not sure...

Hi I wonder if anyone can help me? My family and I have had no hot water for three weeks now. Although I'm not a plumber, I am a marine engineer so am not a complete incompetent. I have a fault on my SE80. The CH works fine but I get no hot water at all. It's not the PCB because I've replaced...