User Manual Frigidaire FFU21F5HWB 20.5 Cu. Ft. Upright Freezer

Check to see if the bulb is burned out, and if it is, replace it with an appliance bulb of the same wattage. If the bulb isn’t burned out but the light is still off, there might not be electricity running to the freezer. If this is the case, the safety signal light outside the freezer will also be off.

Adjust the temperature setting. Set the control knob to a lower number, then allow 24 hours for the temperature to stabilize.
Open the door or lid less frequently. Whenever the door or lid is opened, the warm air that enters can cause the temperature in the freezer to rise, triggering the freezer to run in order to lower it again.
Clean or change the gasket. Leaks in the gasket seal can let warm air in, causing your freezer to run more in order to maintain the desired temperature. If your freezer gasket is dirty, worn, cracked, or poorly fitted, you should clean or change it.

Please note that it’s normal for your freezer to run more frequently if:

It has recently been disconnected for a period of time. After being reconnected, the freezer can take up to 24 hours to completely cool down again.
It is a larger freezer. Larger freezers will require more running time to stay cold.
You’ve recently placed large amounts of warm or hot food in it. Warmer items in the freezer will affect its temperature, and it will run longer in order to return to your selected setting.
The outside weather is hot, or room temperature is cold. The freezer will have to work harder under these conditions.
The lid has been opened frequently. If warm air has been allowed in to the freezer, it will run longer in order to return to the desired temperature.

Newer freezer models have greater storage capacity and a broader temperature range, both of which require a high-speed compressor. The compressor is what you hear when your freezer turns on, and it’s normal for the sound level to be higher than on older models.