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Do you have the model number so I can better assist you? It should be located on a sticker somewhere on the interior wall or ceiling of the freezer.
So on on this model number, the door switch is rarely the issue but you can remove the door switch and if you have a multimeter you can check to see if it's making and breaking contact when you push on the switch. If the switch isn't he problem (as I suspect), that means that your display board itself is failing and giving you a false error. You can try to unplug the freezer for 5 minutes to see if the electronics will reset, but other than that the display board would need to be replaced so below is a link to the part.
CLICK HERE for control board
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