Gas and Oil Home Heating Furnaces - Elec. Furnace/auto mode down

First of all, great site! Here is my problem. My electric furnace does not work on automatic. It works when I put the thermostat switch to on. I changed the thermostat, same result. The furnace is located in a crawlspace. Also, the AC works fine on auto. Thanks for the help!

Depending on what type of heat sequencers the unit has, you could have a bad one. May need to call service guy to check this. However, If you still have the instructions that came with the thermostat, read them. lol Some thermostats require a jumper to be installed between certain terminals to allow the thermostat to control the fan in the heat position. Caution, If you do this, and you in fact have a bad sequencer that is supposed to control the fan instead of the t-stat, then you probably will feel cold air blowing when the unit first comes on. However the danger is when the unit is shutting off. The sequencer is supposed to keep the fan running until the last stage of heat shuts off. This helps cool them down. If fan is shut off immediately by the t-stat, and the heat strips don't cool down properly, it will shorten the life of the heat strips, causing them to break into.

What tstat do you have ? Most have cool off heat . Then they have AUTO ON this is for the fan only.Now if you set it to heat ,push up the tstat the fan should come onor in a little bit if not i would say your fan relay in the furnace is dead.If you cant get some one to look at it right away.Try this, set t-stat for heat put tstat at temp put fan to on and let it run all the time.Lots of t-stat out there dont know them all ;) ED

Me again. I just installed a new Honeywell Round. I did this because I was having the problem, the problem didn't start after my install. You are right about the jumper, and I did do that.