a/c not working-how to check thermostat wiring?
My central a/c (Rheem) quit working. Opened the unit and the contactor was fried-completely burned. Replaced the contactor. Can physically push in on the center connections of the contactor and the A/C unit comes on and runs fine (as long as I'm holding it in). Will not turn on by itself. Digital thermostat will kick on the furnace fan, but cannot get the A/c to kick on. Yes it is over 80 in the house and the thermostat is set on 68. It is turned to cool. I've tried clicking to off and back to cool several times. All digital displays look fine.
What next? Which wires from the back of the thermostat would I connecct to get the A/C to turn on to verify that the thermostat was bad? Choices are: green, yellow, white and red.