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i can hear the fan come on as soon as the heating/water is turned on, and the 30° light never illuminates, just the 50°

is there a way to simply check this switch? looking at manuals online, this has 3 wires? a common, NC, and NO? If i put a test lamp/meter on these connections which should show voltage if all is well? I'm assuming the common will be live all the time and the others shoudl switch when the...

Hi, i wonder if anyone could comment on this. Our boiler recently developed a fault where the "fault on fan or flue" light would illuminate. I can hear a faint clicking and the "flame" LED flicks at the same time, but the boiler doesn't light. After 3 or four attempts the fault light...