I have frost on back of unit.what to do?

unit is low on freon

Either way if you had the doors opened a lot, it should like you probably have frost build up preventing proper air flow. You'd need to pull everything out of the freezer and remove the lower back panel inside the freezer. If there is frost build up, you'll need to use a hair dryer to thaw all the frost out. The unit will continue to beep until the set temperature (0 and 38) are reached so that could take a while even after thawing out all the frost build up.

If removing panels sounds like more than you can handle, you can always unplug the unit for 24 hours and leave the doors open to allow the unit to defrost on it's own.

Try defrosting entire unit. Put all food, freezer and refrigerator sides in coolers with ice. Unplug unit and wait at least 24 hours for unit to completely defrost, if neccessary open doors, plug unit back in and see how unit functions. By doing this lines that carry freon should become unclogged.

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check the condenser fan in the lower back to make sure its running,if it quits the compressor will cycle on and off to cool itself instead of the fan doing this operation,and the unit will warm up inside,then the compressor will again restart and any condensation in the unit will refreeze and cause frost

I would say the fan motor has gone bad if it is an older unit the bottom pan of freezer is removable then the back, giving access to the fan, should be an easy fix (10 to 15 screws total) If it is a digital (newer) unit the problem could be in the mother board

Your defrost heater or defrost thermostat needs to be replaced.

the unit is experiencing a defrost issue one of 3 things bi-metal thermostat clipped to the evap.... defrost heater element is now open or very little resistance reading or defrost timer unit you can get fix remove the items in freezer and remove the back panel with hairdryer in hand thaw the frost and unit will oper normal for a time

unit is freezing up because it either has too much freon or not enough. the pressure should be checked on both the low and high sides and corrected.

hi there, sounds like you fridge is short of gas, you will need to take it in to be repaired, and it wont be cheap.

It could be the thermostat. Before getting into that you should check a few other things. Check and make sure the condenser on the unit is clean and has free air around it. On some models the outer skin of the refrigerator or freezer acts as the surface for transferring the heat from inside to the outside air. These should be kept free of those stick um objects and the top is no storage area. On a frost free unit make sure it is frost free. Check the back wall for frost . If there is frost on the back wall the defrost system is not functioning properly. Check the temperature. Depending on what you are storing determines what temperature is necessary.