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nope, I've disconnected the blue one.

I've replaced the thermostat with the new siemens one, but initially connected the blue (neutral) cable as well which caused the 3A fuse to blow (the one next to the time control panel next to the boiler) I've disconnected the blue cable as suggested above, then replaced the fuse in the...

Hi, I'm replacing an old thermostat (Potterton PRT100ST) with 3 connections and (symbols): 3 (N) blue 2 (H) yellow 1 (TL) red on the new one (Siemens RDH10) (from manual) LX = Common L1 = Live feed to item to be controlled L2 = Changeover contact What colors should I plug...