[jmasker]

I have aside by side freezer out of no where iced up in freezer temp rose signif i removed back panel and defrosted with heat gun restarted what is this cause and suggested repair

[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.

check defrost heater, defrost thermostat Refrigerator Repair Guide: How To Fix a Refrigerator - ACME HOW TO.com

In your unit your 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. If the heater and thermostat are ok it’ll be the control.


Adaptive defrost control is part 13 on this diagram. Maytag Appliance MZD2766GEW Parts List