Carrier Central Air Conditioner Not Cooling

by Chad
(Glenford, Ohio)

I have a carrier tech2000ss central air conditioning unit. Turn air conditioning unit on yesterday and left for the day. Came home and house was warm. I replaced the furnace filter, washed the outside unit and then noticed a short humm noise that lasted about 2 seconds. It repeats itself about every 3-5 minutes.

The lights in my basement dim during this hum noise (2 seconds) and I can actually here the hum at the breaker in the panel during the "surge". I pulled cover and checked the compressor. It was hot and the line set wasn't cold at all.

The capacitor doesn't have any defects but the contact switch (where the 3 wire comes from the outside breaker box into the unit) does have a little black on one of the terminals. Not sure what the deal is, but it is definitely calling for power (the hums) so not sure if a piston is stuck in the compressor or if there is an electrical issue.

The fan on the outside unit runs just fine. The wires to the breaker box are tight, so it shouldn't be a loose wire. Thanks for the help. It is a copeland zr48k3pfv235 compressor.