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The boiler fires up but shuts down after 20 mins and stays like that till next cycle. It is pumped and pump is working. Motherboard is newish. Radiator water is very hot even though I turned boiler down to min. I can restart it by turning control panel to constant then push button on boiler.

My C. Heating comes on ,reaches temp then switches off but doesn't come back on even though 'on' cycle is not finished.It will come on again on new cycle when both HW & CH are requested. Room stat works(clicks). Have tried switching both tank stat & room stat to zero then turning each on with...