[kjself73]

My freezer is working overtime and the upper fan that blows air into the fridge is not running. I took off the back pannel in the freezer to expose frozen cooling coils. There is ice in the top of the freezer also where the fan blows air into the fridge. I had the same problem a little over a year ago, but don't want to pay for someone to come out to fix it again. Can anyone help with how to fix this?

Thanks!!

[woodchuck]

If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too. The fan won't run when it is in defrost mode.

check defrost timer, defrost heater, defrost thermostat

In most of the new units they now have the adaptive defrost control. It senses when to defrost based on how many times and for how long the door is opened. It's more energy efficient but there does seem to be lots of problems with the board.

Refrigerator Repair Guide: How To Fix a Refrigerator - ACME HOW TO.com