The relay probaly went out in it the click it the relay firing but it is not cutting the current when you hear the click that is when mine would turn on or off if you open them up it will void a warranty if one still exists do you know how old it is? if it is out of warranty then open her up and there should be a relay(would be connected to the 2 temp humity knobs) that you could replace with some parts off grainger.com I am in no way a pro at this shit but I always mess with my stuff if there is no warranty and always label the wires, if you are mechanicly inclined that is if not I would contact cap or the guy you bought it from. This is just a guess I don't want you to mess anything up you know.