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I have recently installed a Honeywell t6620B room Stat(replacing a very old stat) Since doing this a switched fuse to the programmer blows every time the heating is activated (ie set to 21 degrees) I am wondering if the Stat is\wired correctly. 3 wires that are connected to it are : red, black...

I recently had a new 7 day programmer (Honeywell ST9400c) and a room stat (Honeywell T6620B) fitted to my gravity fed system. These were replacements for older models. At first worked ok but then the fuse in the switched fuse to the programmer started blowing on operation of the central...