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i have a glow worm boiler, graundfos pump and honeywell 3 way valve, that i have taken apart and seem to work correctley, If i have just c/h on all rads get hot , if just h/w thats fine but if the water comes on when the c/h is already on the downstairs rads go cold until the water is up to...

i have a glow worm boiler, graundfos pump and honeywell 3 way valve. when only ch is on all radiators get hot. when ch and hw are on only the upstairs radiators get hot, all downstairs cold. i have drained and flushed the system and bleed. removed the 3 way motor and checked the operation of...