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My combi boiler pump is working because because i can hear it when i listen to it, but my radiators are not heating up. The boiler kicks in when it should do, but then turns off as the pump isnt pumping around the system. Any ideas whaat is wrong. I bled all the rads and all air free...........

Im trying to replace my old Drayton digistat 3 with the new version due to the original not being made anymore. I dont get all this call for heat stuff because my instructions only say on the block of 3 terminals C, ON, OFF. PLEASE is the red wire terminal C and if so and does the yellow...