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@RandomGrinch - Lol, thank you so much for that - gotta love standards, eh? :LOL: I wonder how anyone would go about checking that a particular control device - like my Halo Lite, isn't faulty, if they don't have a compatible boiler to connect it to... :confused:

@RandomGrinch - thanks for your reply. I had thought about the power level but I was under the impression the Opentherm physical interfaces were fairly standard and that all devices were compatible. I was wondering if anyone was aware of any incompatible devices or some that needed none standard...

Hi, I recently bought an Ideal Halo Lite Thermostat (through Ebay, although it was sold as and looks new). I want to learn about Opentherm so I've built a "hub" based on the readily available interface circuits. The slave and master interfaces appear to talk to each other quite happily but...