The Whirlpool model WZF79R20DW features an alarm system to warn owners if the temperature increases to endanger the food in the unit. As of 2015, Frigidaire and Kenmore also offer alarm systems on select freezer models. Models that include alarms are generally more expensive than basic models.
Because freezers are for long-term food storage, users often go for several days without opening the doors. Without a warning system, a freezer failure often allows the food stored inside to spoil. Alarms alert the owner so that he has the opportunity to correct the situation or transfer food to a safe location.
When the alarm goes off, owners may be able to remedy the issue by ensuring the unit is level, the food does not interfere with closing the door and that the door seals correctly. A small opening between the door and freezer allows an air leak that sets off the alarm. Without prompt attention, the owner often encounters a freezer filled with spoiled food.
If the manufacturer did not equip the freezer with an alarm, after-market systems are available. A sensor sits inside the freezer, and the warning device attaches to the outside. It offers an effective, yet less expensive method of monitoring freezer temperatures without replacing a unit.