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Perfect, thank you so much! It works now!

How do you know this? I've heard that term thrown around quite a bit, but I'm very beginner so don't fully understand it

Thanks, @ericmark . So to be clear, it would be L -> L N -> N COM -> 24v NO -> 0v (Are the com and NO wires interchangeable i.e. can com go to either 24v, or 0v? And same for NO?)

This is the thermostat RF receiver, and the boiler wiring.

I have not fitted a thermostat before, and have basic electrical knowledge. I bought this smart thermostat (https://a.aliexpress.com/_Eui4tLE - don't judge me!) I want to connect it to my Glow worm Ultracom 24cxi boiler. I have the following terminals on my boiler: 24V, Ebus, 0V, OTC 1, OTC 2...

I have a similar set up to you! However, I bought this smart thermostat (https://a.aliexpress.com/_Eui4tLE - don't judge me!) I want to connect it to my Glow worm Ultracom 24cxi boiler. I have the following terminals on my boiler: 24V, Ebus, 0V, OTC 1, OTC 2, Earth, N, L, R, F (the 24V and 0V...