On Monday, we had service installed, including Xfinity Home. Ever since the tech installed the new thermostat, our heat doesn't work. The A/C works fine and the furnace will run, but never get up to temperature. The thermostat knows it's not the correct temperature and the furnace runs continually. It would seem the problem lies in the furnace, but it seems far too coincidental that the heat worked, a new thermostat is installed & immediately after, no go on heat. Thanks in advance for any assistance.
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