Door was left ajar and it wiil not freeze - Frigidaire 20 cu. ft. / 566 liter Upright Freezer FFU20FC4A

Cut off the circuit. Everything runs on the system together so you may need to contact someone that knows what they are dong.

your freeze caused some technical problem,you read your freeze catalouge and there must be get solution.

cooling temperature of freezing is damaged and also damaged heater machine which keep in deep freeze but controller point keep in normal side,you must be repair that problem as soon as possible otherwise full freezing system get damaged.

Sounds like the main control board to the unit needed to be reset and with the resetting it has caused a communication error with the door sensor. Contact a service tech to move forward with a repair.

This is a symptom of air leaking into the freezer. The most common place is around the door. Check the door really good to make sure something is not obstructing it from closing all the way, it may be closing enough to satisfy the ajar alarm but not enough for a bit of moisture to sneak in. Look for tears or breaks in the seal. If you put a bright flashlight inside the freezer and close the door, turn off the lights in the room you may find a leak that way.

well that light is the thermostat light and you should increase it for better performance.

You should unplugged and let all the ice melt and help it with a hair dryer.

If it's frosted up, it's best to defrost manually with heat gun. Find the timer and advance until it goes back into defrost. The timer looks like a residential fridge. It cut the compressor off and the heaters on.
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If the door was left ajar for any extended period frost has built up on the cooling coils. A complete defrost of the freezer should take care of the problem. Normally a frost free system will clear the ice from the cooling coil when the defrost time cycle happens. However frost may have built up in areas where the heaters can not readily remove it in a normal defrost cycle and shutting the unit down with the door open for about 24 hours should clear it out.

Hi ,
ngafm at your service,
If its cold and frozen it may be that the door switch that activates this light in the case that the door is ajar, is faulty.
Or it may be that the temperature is dropping to slowly for you to see it by eye!
The whole purpose of the, "door ajar" light is to protect you food from spoilage and to warn you before it gets to warm!
Door ajar or not!!!
My advice is to fix the problem now no matter if it is only the switch causing a false alarm.
Or the worst case scenario !

You need hands on service!
Bless You ,
ngafm,
please give me a good rating before you sign off.
Thank you.