I RECENTLY REMOVED A RAD IN MY CONSERVATORY TO PLASTER BEHIND.AFTER ISOLATING IT I NOTICED THE RAD IN MY KITCHEN WASNT GETTING HOT & ASSUMED BECAUSE I HAD SHUT OFF BOTH ENDS OF THE RAD IN CONSEVATORY THE FEED TO THE KITCHEN ONE HAD BEEN CUT OFF.AFTER REPLACING THE CONSERVATORY ONE STILL HAVE THE SAME PROBLEM.THE INLET & OUTLET PIPES TO THE RAD ARENT EVEN GETTING HOT.I HAVE A SEALED SYSTEM WITH COMBI BOILER.AFTERA BIT OF BLEEDING THE SYSTEM SEEMS OK APART FROM THE KITCHEN RAD.AS I SAID THE PROBLEM STARTED AS SOON AS I SHUT OFF THE CONSERVATORY RAD AT TRV & LOCKSHIELD VALVES.CAN ANYONE ADVISE