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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 when I connect the Halo Lite the hub reports (via an Arduino) a series of "T..." messages from the thermostat and responds with "B..." messages. So it looks like the thermostat is working to some extent but the display shows nothing at all so I have no idea what's going on.
Any suggestions would be welcome.
Any suggestions would be welcome.