Power

• If the freezer is not running at all, check the fuse or circuit breaker. Freezers require a great deal of electricity. Something else running in the vicinity at the same time can trigger a safety stop.
  
  

Compressor

• If the freezer is not cooling as well as it should, listen to hear if the compressor motor is humming or making a steady noise as it should be.
  
  

Thermostat

• If the compressor is working, the thermostat may need replacing.
  
  

Evaporator Coils

• The freezer also may not cool properly when the evaporator coil freezes over due to dust and dirt. This requires unplugging the freezer for a manual defrosting. If you want to clean the coil, you'll need to open a panel at the back, which should be diagrammed in your owner's manual.
  
  

Defroster

• Ice build-up inside the freezer indicates a malfunctioning automatic defroster.
  
  

Continuous Running

• If the freezer runs continuously, the thermostat may be defective, the level of refrigerant may be low, or the freezer may be too close to a wall. This leaves the condenser coil unable to radiate heat away from the appliance.
  
  

Noise

• If the freezer is noisy, it may be simply that the appliance is not level, or much worse, that the compressor may be failing.