Hello, new to the site, would appreciate any help. My A/C was running and then the air handler shut off but the condenser continued to run. The house was not cool (not a stuck contactor) and now the air handler wont come on. I am getting voltage on both sides of both transformers (its a gas furnace) and the only way to turn on the air handler is the switch on the handler. It is an older unit (no board), and the switch has 3 positions (ON, OFF, FAN). It would normally be in the ON position, but currently the only way the handler will turn on is in the FAN position. I am steadily checking different parts, t-stat is next, but if anyone can point me in the right direction that would be sweet.