Had a new HVAC unit installed after the previous unit croaked on a 115 degree day this summer. (Tucson). Something was grounding out improperly and it fried the fuse and all of the rest. It was also 30 years old.
Fast forward to winter time. The heat has been working okay up until just this past week where we've reached freezing temperatures at night. I have an ecobee thermostat. It is set to prewarm around 7am. The system hasn't followed commands from the schedule nor from a manual request. I've tried unplugging and plugging ecobee back in. It did make the system do something for one minute but then it quit again. Finally it starts up again around 10am. The first day it did this there was also a weird burning smell. Not quite as noxious as tar. It continues to decide to act alive around the same time each day but not exactly the same time. Today it started with blowing cold (defrosting process?) and I can hear it doing something but the fan has stopped and nothing is blowing. Later on today it will likely work. It doesn't have problems in the evening.
This is surely a dumb question but is it possible that since the unit is designed for extreme summers that the heater just can't cope with freezing temps? Or is it a completely normal expectation that a heater will heat regardless of temperature? Any ideas about what is the problem? Thermostat in the unit? Coil? More crazy grounding-out?
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