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Thanks everyone. Very helpful, even if it’s bot the answer I was looking for. Saved a lot of faffing about trying to work out why it wasn’t working. Drayton onto eBay and I’ll give the Hive a go.

And, sorry, one more question - what was my Potterton EP2001 doing then? It seemed to turn on the boiler when the CH turned on.

Ok, thanks. I guess that’s my answer. Do you know if there are any other wireless systems that can work with a gravity system?

Yes, I’m pretty sure it’s a gravity system.

Thanks sxturbo and CBW. There isn’t a thermostat anywhere so I assume it was set up to run the CH for as long as the timer was on. As for Y vs S plan, I’m not sure I’m afraid. The only valve I can see is this one below the HW tank. Not sure if you can tell from that.

Hi, I have recently installed a Drayton Wiser Kit 2 to replace an old Potterton EP2001 with an oil fired boiler (Grant Euroflame). I’ve wired the Wider with the same wiring setup as the Potterton, expect without the link wire from L to 5 (as someone helped me with on this forum). The HW is...

Thanks all. You’re right ericmark that mine does not have opentherm. I’ll report back once it’s all (hopefully) working.

Thanks very much Stem, and sorry for getting that wrong.

Hi, not sure if this is the right place to ask this question, but I have a simple set-up with a Potterton EP2001 with the attached wiring diragram that I’d like to switch to a Wiser set-up. 3 is hot water and 4 is CH. Do I just copy the wiring in the EP2001 but without the link wire between L...