Frigidaire upright digital freezer stopped running. how do i turn it back on?

Hello Michael - Sounds like the temperature control was accidently turned OFF. When this occurs the temperature control turns off the compressor, but does not disconnect the power to the light bulb or other electronics. Let's try activating the freezer by pressing the UP arrow until display shows "4" or desired setting. Allow 24 hours for temperature to stabilize. For future reference you can lock the control to keep from accidently changing the temperature setting. I ask that you please follow up with a comment on the post, at your convenience, to advise if further troubleshooting is needed or if the unit's status has changed successfully. Thank you.

besides hitting the compressor with a hammer. unplug and lay on its side for 2 hours then upright for 24 hours plug back in. Never ever unplug a freezer

I’m happy to assist further over the phone at https://www.6ya.com/expert/james_1cb31da1bc8c6102

Start relay.

By stop running do you mean become quiet or do you mean quit cooling and unthaw all the food?

If you mean turn off and still be cold then that is normal.

If you mean turn off and warm up that is not normal

The freezer control(thermostat) is bad based on your description.

Sounds like your defrost timer has packed it in you need to fit another timer to it and everything will be as good as new.
by turning the timer you have forced it to run nothing to worry about. It has just stopped in the defrost position. What you have done is the first diagnostic test a tech would have performed. I hope this has helped you out.

yes you should let the oil run back into the compressor by leaving it unplugged for 24 hours.

Go to Home Depot find you a timer they start at $10.00, you know turn lights off/on when your not home. . They have an digital one for about $16.00 Set it up, ck your times, run it then shut it off for a while keep adjusting till you can keep the temp you want.

Sounds like the timer could be getting stuck and not releasing the defrost cycle. If you have to do it again, you should have the timer checked, or just replace it.

IF THE FREEZER IS AUTO DEFROST, DO YOU SEE A FROST BUILDUP ON THE BACK WALL? IF SO, YOU NEED TO DIAGNOSE THE DEFROST FAILURE. THERE ARE THREE ITEMS TO THE DEFROST CIRCUIT. THE TIMER, HEATER, AND BI-METAL. FIND THE TIMER, USUALLY ON THE BACK OF THE FREEZER DOWN IN THE CORNER NEAR THE COMPRESSOR. IT WILL HAVE A CONNECTOR WITH FOUR WIRES ATTACHED TO IT. IT HAS A KNOB THAT CAN BE TURNED TO PUT IT INTO A DEFROST CYCLE. WITH THE FREEZER RUNNING, START TURNING THE KNOB UNTIL THE COMPRESSOR STOPS. THAT WILL BE THE DEFROST CYCLE. THEN WAIT 5 MINUTES AND LISTEN IN THE FREEZER FOR A SIZZLING NOISE AND LOOK FOR A GLOWING FROM THE BACK BOTTOM. IF THE HEATER IS ON, THE TIMER IS THE PROBLEM. IF THE HEATER IS NOT ON, THE HEATER OR BI-METAL IS AT FAULT.
IF THE FREEZER IS NOT AUTO DEFROSTING, CHECK TO SEE IF THE COMPRESSOR IS RUNNING. IF IT IS, ARE THE SHELVES ALL FROSTED? IF NOT, YOU HAVE A SYSTEM FAILURE. IT COULD BE A LEAK, RESTRICTION, OR FAILED COMPRESSOR.