I am having the same problem. Have power to my boiler but I am getting
an E74 message - No power to thermostat. Hope that someone can respond.
I am seeing a number of people that are having the same issue.
I am having the same problem. The thermostat has worked fine for 3
years, suddenly, on the coldest day (-6 degrees) I have no heat. My
furnace has power but without the thermostat operational, it won't stay
on.
