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Thanks for your responses, Ian. I'm very fond of my chocolate fireguard! :) Doesn't the changing voltage read out on the Volt-o-Meter 2000 at least suggest something is happening? Or is it so useless that it's completely untrustworthy? I opened up the boiler's electrics, and I guess because it...

So I rewired as per Chris's suggestion, but no joy. I then used a mains voltage tester in the Close (1) and Open (2) ports, both when the thermostat was calling for heat and when it wasn't. First, when it wasn't calling for heat, Close gave a reading of 220+V and Open read 36V. Then, when the...

Thanks for your replies. My understanding from reading around online is that ports 1 and 2 are for boilers with actuators, and that if you put the s-live into them it can cause damage to the boiler's circuitry.

Hello, Could be this has been solved on here already, but if so, I can't find it. SO any help much appreciated. As per title, I am attempting to replace an old Honeywell D40 with a BEOK 313WIFI. The Honeywell was wired as shown and I have wired the BEOK as shown in the second pic, bridging from...