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ah good stuff thanks. Exactlt, only heating radiators with both switch on (though they did work independantly before). The first test went as you described, when i switched the stat down to 20 on the cylinder the c/h system worked as it should, regardless of h/w settings. Oddly i've...

Hi, just looking for some advice.. I have a potterton prima f boiler, potterton EP2002 controller, PRT100 mechanical thermostat, MYSON power extra valve, europa circulating pump the trouble i'm having is when i turn my heating on on the controller, the light comes on but the boiler...