[Altavia]

Originally Posted by Theradiokid

If your fan does not stop after popping the thermostat off, then the problem will be the fan in your furnace enclosure ("Air Handler" or "A/H"). There is an electronic control module (ECM) on the end of the fan that manages on/off and speed which has been known to fail. I replaced mine by myself a couple of years ago for about $250. Furnace models are fairly common here, so your tech may have a compatible module. If not, they may recommend replacing the entire motor. With labor, you should expect to pay quite a bit more for this. I hope your problem is simpler than this... good luck.

Do you still have the info/mfg/part number for the replacement controller?