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Does anyone know how to "pair" the thermostat to boiler. I have changed batteries in thermostat and can't get boiler to come on although it fires up when I put hot water on.

I have this boiler and every now and again it doesn't kick in and I have to turn the remote Siemans thermostat up. Today I came home and the thermostat display wasn't showing. I changed batteries but and display working now but heating still not coming on. Pressed reset several times and not...