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Hi namsag, Thanks, I will check to see if controller is double insulated. I think you are right now thinking about it, but will double check tonight. Many thanks for your help, most appreciated. :) Rob.

Sorry, forgot to mention last time, but an integral mechanical timer is currently fitted.

Hi namsag, Thanks for that, it makes perfect sense now. That's how I thought it should be connected and couldn't understand why terminal 1 should be connected to the L terminal, if 240V is already being provided to terminal 1 on the controller via terminal 1 on the Boiler. Anyway, I don't...

Ok, you say that terminal 1 from boiler provides 240V to the controller terminal 1 when selector switch is set to CH. If this is the case, could you please explain why I 'also' need to connect the controller L and 1 terminals together? Is this correct, or have I got the wrong end of the stick...

Hi again Baxipoti, Many thanks for your help on this, it's most appreciated. Anyway, just to clarify then, here are the connections that are needed as I understand them. 1. Connect L and N from Terminal block on Boiler PCB to L/N terminals on ST6100 controller to provide the supply...

Hi again, I forgot to mention in my previous post, but the honeywell controller instructions mention about linking terminal 1 with the L terminal if normal mains voltage switching is required, i.e. not potential free mains switching. Could you please clarify which option I'd need to use to...

Thanks for the info Baxpoti. The wiring diagram doesn't show whether or not the external controller is powered from the fused side of the mains input terminals on the boiler. Would it be ok to connect it this way, so that the controller would be effectively fused via the pcb fuse? Also, I...

Hi There, I have just purchased the above controller and wondered whether anyone could advise on the connections to the boiler, or provide a wiring diagram showing how they interconnect? I am an electrical/electronics engineer so am competent to carry out the wiring myself, but just not...