about 3 weeks ago I turned the system off (at the thermostat) because of the pleasant weather. When I woke up to 31 degrees and tried to turn the heat on, NOTHING happened. Tried to turn the air on NOTHING happened. Tried to turn just the fan on, NOTHING happened. The thermostat clicks, but that's it. The thermostat was updated to a digital about 3 months ago, so all was tested then. Went through summer in Alabama with no problem with the air at all. All of a sudden NOTHING.