Heat Pump question
 

what is wrong with heat pump when it stops cooling/running ? Unit is about 1 year old, and simply stopped working.

Could be any number of things. Could you be more specific? Is it not running or not cooling, there's a difference.

I once had a problem with my 1984 Carrier Model: 38QB030300 SN: U402518 2.5 ton Heat Pump. It acts like it's going to start.......buzzing and humming......but in a couple of minutes it just shuts down. I don't know anything about heat pump, so I called a repairman, problem solved when he simply replaced the capacitor.

A totally dead unit should be easy to troubleshoot.