I'm having problems heating only the water with the boiler. When i have heating & water set it works fine, but when i try to heat the water only, the heater goes off & the light to show sanitary demand never comes on.
Look to see if the pin moves out of hydroblock behind flow switch, if it does not diaphagm at fault, and could be microswitch but more than likely diaphragm
Tony if you dont know what your on about dont post
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