The freezer has a temperature sensor. The controller board uses the thermostat to read the temperature in the freezer. If the thermostat isn't accurate, replace it.
Follow these steps to fix your issue:
Disconnect the electrical power.
Shut off the circuit breaker for the freezer and unplug it. If you want to keep the food fresh, move it to a cooler. Most frozen foods will not be affected by the 45 minutes without power in the freezer.
Remove the evaporator cover.
The drawers are in the freezer. The screws are on the cover. Remove the cover from the freezer.
Remove the thermistor.
The thermistor mounting screw can be removed. The old thermostat needs to be removed before the wires can be cut.
Connect the wires to the new thermistor.
The end of the wires in the freezer have insulation on them. The wires need to be cut about 4 inches from the thermistor. Use wire nuts to connect the wires.
Install the new thermistor.
Attach the new thermostat to the wall with a screw.
Reinstall the evaporator cover.
Go to the back wall and position the cover. There are drawers inside the freezer cabinet.
Restore electrical power.
You can restore power by plugging in the freezer or the house circuit breaker.
Time required: 45 minutes.
You would need the following tools: Phillips screwdriver, wire stripper.
Let's Get It Fixed!
Our virtual experts can diagnose your issue (for free!) and resolve simple problems.