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I called ROBERTSHAW and thye told me that if I hear the thermostat 'click' when I set temp below room temp, then it send signal to AC. But the AC is not receiving signal.
Right now, I realized, the...

My Rheem AC and Robertshaw 9600 prog Thermostat (both 4 yo.) are not in same temperature. Thermostat NOT programmed. I manually set 80 when not home, and 74 when home. Two weeks ago problme started....