My a.c. and heating won't Come on when I turn on the thermostat. I have tried the breakers and have took the thermostat off and caped the wires together to see if it will kick on but still got nothing. The heating was working fine all winter long ,but when it start getting hot we turn it off on it won't come back on along with the a.c. What else can I try before I call someone to look at it.I don't want to pay someone to come out for something small and easy.