my 3 speed fan control wont work at all now, previously it would go off and on as it pleased, but now its just broke...at first i thought it might have been a problem with the fan itself, but it will work with the 3 speed AC control...

should i go ahead and replace the heater control unit? or is there something else to check?

 

Umm i think there is a resister in the switch that sometimes burns out, my guese is thats what burned out if the ac control still works. sorry im not more of help as i've never really looked much at that