I was wondering if this was a problem with the heater or the thermostat...
Our heat turns on when I turn the temperature up on the thermostat. When the thermostat reaches the heat temp, it turns off. When the temp then drops below the thermostat temp, it will not turn back on. This morning we woke up to a temp 8 degrees below the set temp. I raised the thermostat a degree, and the heat kicks back on. It sounds like a thermostat problem, but it seems strange that it is reading the temperatures but not sending a message to the heater to start back up.