Central air system won't blow warm air
I have a central air system that won't blow warm air. I'm wondering if I need a new thermostat.
Right now, I have a White Rodgers 1F86-344. The fan works when in the 'on' position, but not in the 'auto' position. Also, 'cool' works, but not 'heat.' When I turn up the temp, I hear the click, but then nothing happens.
Also, I just so happened to have a Braeburn model 3000, still in the box. Is it compatible with the White Rodgers?
I am grateful for any help I can get.
David
Little Rock