Potterton EP2000 to Tado V3+

[DMC88]

Looking to upgrade my controls to the wireless version. Bought this kit

Tado V3+ Black Edition Wireless Heating & Hot Water Smart Thermostat Starter Kit

Order online at Screwfix.com. Works with combi, system and conventional boilers, as well as wet underfloor heating systems and some oil boilers. Includes receiver, which allows smart thermostat to operate wirelessly. Schedule and control heating and hot water from anywhere using the Tado app...

www.screwfix.com

To replace a Potterton EP2000, Satchwell TL35 (I think, looking at pictures, although mine has 4 wires, blue, green/yellow, yellow and black which doesn't seem awfully common).

Tado have only included 3 Wagos to decom the old wired stat, can I terminate 2 different colours safely in one?

Then behind the programmer there are a sea of wires. The black stat wire doesn't seem to make it back to the programmer along with the blue and yellow wires, is that normal?!

Can I ask for some help mapping the Potterton terminals to the Tado terminals please, the Tado instructions make it seem extremely simple but I appear to have a lot more wires to deal with?

Do I need to choc block the stat wires at this end as well?

Thanks in advance

 

[CBW]

Colours aren’t common in a heat system. You can probably decommission the room thermostat and just use the L and N, Heating On and Hot water On from the programmer. Hard to tell if you have hot water off, because that’s usually terminal 1. I think terminal 5 is linked live wires.