I have just put a steam humidifier in a house and am having a new problem that I have not seen before. When the humidifier calls for the fan to come on, the condenser contactor pulls in and the condenser runs. It is a rheem 2 ton split heat pump and the air handler has a x13 blower motor. I ran my 2 wire fan switch from my humidifier to the air handler and I have one wire hooked up to my 24v hot and 1 wire to my G terminal. I am wondering if my voltage in backfeeding through my thermostat and sending voltage to my contactor. I have put in several skuttle steam humidifiers without having this problem any help would be great. Also I am new to this site and if I have broken any of the rules please let me know.