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HI, WITH REF TO MY INTESA TP23 COMBI BOILER.WHEN I SWITCH THE CENTRAL HEATING ON THE BOILER GOES THROUGH THE SEQUENCES AND THE PUMP SEEMS TO BE WORKING BUT THE RADIATORS STAY COLD FOR ALONG TIME.( I LEFT THE BOILER ON FOR ABOUT 2 HOURS)THE UPSTAIRS RADS APPEAR TO WORK BUT THE DOWN STAIR RADS...