1. Check the breaker to see if it has been tripped.
2. Check fuses on the outside disconnect switch.
3. Check contactor switch inside electrical panel on outside unit to make sure it is getting a call for cooling, you will hear a humming sound if it is working.
4. Capacitor is bad. Check with a multi-meter that read micro farads. Remove wires from the Herm terminal and place leads on bare terminals. Mfds should read within 5mfds of what capacitor is rated.
Anything else would require trouble-shooting the compressor which can get extensive. Also if you have tripped a breaker or blew a fuse, the compressor could have shorted out. In case of a short, do not keep trying to replace fuses or resetting the breaker. Hope this points you in the right direction!
So I just had this happen with my Frigidaire fad704dwd dehumidifier. I went to basement and heard it running and sounded off. The compressor was running fan was off which is bad and humidity said 30. I then pushed the off button and it stayed running. I was able to fix it. To make long story short it was a bad ground. I took the plastic back, sides, and front off. There was a green ground (main ground) and Green/yellow ground (fan ground) on the front coil with a bunch of rust. Removed the grounds connected them both together and cleaned the surface area and used a new stainless screw nut and screw to remount the wires to evaporator coil. Everything started working fine after that and I put it back together. Good Luck
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