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I checked, it is low voltage....

I read too that as it's a low-voltage set up, it doesn't actually matter which way they are connected....

I am wiring a thermostat into my combi boiler. The live brown and blue neutral I am fine with. I can see from the wiring diagram that the two terminals A and B on the receiver box are used. There are two wires from the boiler coloured black and grey. Which goes to which? I understand from what I...