Freezer is Not Running
If you do not hear the unit running or see the interior light turn on when you open the door, verify that the freezer is plugged in and the circuit breaker switch is on. Adjust the thermostat to a lower setting and wait an hour to see if this turns the motor on.
Freezer Does Not Cool
Make sure there is adequate air flow behind the freezer and inside the compartment. Rearrange your food so the freezer is not completely full. Defrost the unit to remove any ice that may cover the coils or prevent the freezer door from closing.
Open the door of the freezer and press down the door switch while you listen to the noise. Replace the circulating fan if the noise gets louder with the door open. If the sound is coming from behind the freezer, call a technician to inspect and replace the compressor.