i installed a 3 ton package air conditioner with heat strips in a 680 square foot home. the cooling works great, but the heat cycles on and off at about 30 second to one minute cycles. ive noticed that the heat strips work correctly if the fan is set to on, but if the fan is set to automatic, the fan runs for 30 seconds to about one minute, which does not allow the heat strips to go through a full heat cycle. is my problem in my thermastat or the fan relay? i have had 2 professionals look at the unit, and they could not solve my problem. i need help!