N821 has just 1- 120 element.
1. Verify ventilation from outside lower refer access door up thru the roof is clear of obstructions. You will have to remove the top roof vent to verify upper area. Just 4 screws removes it
2. Verify your model does NOT have a 12 volt cooling fan just below the rear condensor coil. Step 1 with a flashlight will verify that.
3. If 1 and 2 check out, you then disconnect the 120 heat element from the rear control board and run 120 volts direct to the Heat Element for 24 hours. IF after 24 hours the freezer is NOT below 10 degrees and the lower refer is NOT below 40 degrees, your Cooling Unit is bad and needs replaced. Doug
