Product review (4 stars): You Need This If Your Fridge Does Not Go Off Or Stays On...
If your fridge does not seem to go off and is still not cold, you probably need this defrost timer. This timer corrects the on/off of the defrost heater(s) which is, on average, a 35 minute cycle every 16 hours.

If your fridge seems to operate normally but it doesn't seem as cold as it should be and/or you see frost buildup in the back of your freezer, you probably need a new defrost heater/thermostat such as&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/GE-WR51X442-Refrigerator-Defrost-Heater-Kit-with-Thermostat/dp/B003BIGDIQ/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">GE WR51X442 Refrigerator Defrost Heater Kit with Thermostat</a>.

One caution is to choose a reputable seller since you may be shipped a cheap generic as I had with 2 other purchases made with Seneca River Trading. Stay away from them!