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Thanks McCombi, That got it working. Underneath the unit are two screws that when loosened the entire unit comes off and on the back is a switch, albeit tiny switch that then puts it to a 3 day switch, (don't know why this isn't on the front tbf), then once I'd reattached it there were now 3...

Thanks, but how do I get to the switch on the back ? The electrician attached it to the wall, hope he hasn't accidentally done me over here !! I've included a few photos to show what I have, thanks again.

Hi all, This seems like a friendly forum so I thought I'd give it a go. I've just had my gas boiler replaced and had a Siemens RWB 1007 timer installed as part of the installation which works fine except that I can't set a third on/off time. I've called Siemens, but their recorded message told...