Question about Heating & Cooling
That can be the controller board or the thermostat. To rule out the thermostat first take it off auto and see if that does anything, then set the temp much higher and lower and finally try disconnecting it. You can also check the signal from the thermostat with a voltmeter. You don't really care what its doing as long as it changes. If you see that signal to the connection on the furnace then the thermostat is ok and it is the controller.
Posted on Nov 11, 2010
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Posted on Jan 02, 2017
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