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Finally managed to swap out the old relay for the new one and it was successful. Thanks to you all for your help with this!

The T3R Relay should be arriving tomorrow and then I can report back with the outcome.

Yep did exactly that a few times but still no luck. There was no wireless signal logo on the thermostat once i did the binding steps and the relay didnt go solid green. The relay red flashing light turns off and doesnt do anything when i increase the temp on the thermostat. I've ordered this new...

I removed the yellow link wire and it still didnt work so i think this relay box isnt compatible with the T3R and i need to change it to a newer honeywell home relay.

Hi everyone, i need some help with the Honeywell BDR91 relay wiring that i am trying to get working but have no idea what to do. This was originally paired with a CM921 thermostat but the screen on it stopped working. An engineer came out and said he has "disconnected it" so the boiler has been...