AC keeps shuting on and off thermostat replaceddid not fix?

Answer 1

Hi, Your short cycling condition is likely to be due to a automatic reset device inside of your A.C. condensing unit outside.
Most likely a High Refrigerant pressure limit switch or a Low Refrigerant pressure limit switch that is automatically reseting itself after the unit sits for awhile and then repeating its cycle until someone goes out there and remedies the condition causing this.
Some compressor have safety limit switches connected to their windings that will do the same type thing.
Just a few examples of what could be causing this trouble are as follows. Compressor condenser coils dirty or air flow pattern obstructed in some way by some alien type object being place in such a way by it that it obstructs normal air flow for proper operation. Bad or weak running capacitor on either the condenser fan motor or compressor. Fan motor runs and cuts itself off on internal overload condition thus causing a chain effect with the high pressure safety control. ( I've personnally seen all of these many many many times and they are the most common ) There are others, but in all likely hood this will find your problem. Hope this helps: Jimiwane