Bryant Plus 90t with New Thermostat
Should not be possible to have that happening with a basic 4 wire thermostat. In the ON position it energizes the G terminal and whether it is programmable or not nothing changes. There is the very real possibility that they mixed up the wiring and it is energizing the AC wire. If the AC has the high voltage shut off for the winter it won't run and get damaged. It will energize the contactor for it and tell the circuit board to switch the fan speed to 100%. You definitely need someone to properly check the wiring soon. The circuit board may now be damaged. In the mean time leave the fan in Auto and it should be safe. Shut off the breaker for the AC or its outdoor switch. It may be off due to the low ambiant control and as soon as it hits 50 deg F could start and get damaged. If damage has occurred then print this post as most qualified techs will understand it and you may have grounds for a complaint with the 2nd company. Cheap thermostats have cheap electronics in them and can damage circuit boards. I would not necessarily keep it.
"Cut it twice and it is still too short".
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Last edited by yuri; 04-02-2011 at 04:13 PM.