Good Afternoon, My name is Houston and thank you for using FixYa! Your defrost system is made up of three components: defrost heater, defrost thermostat and defrost timer/control board. Since you have the ABB2223DES Amana the defrost timer is incorporated into the electronic control board (P/N: 12868513) which is located behind the control panel in the refregerator section. Unfortunately, it is in the $100 range, so let's hope that it is either the defrost heater (P/N: 67001794) - approximately $30 - and is located on the right side of the evaporator (the coils in your freezer section). If you have access to an ohm meter, you can test it by disconnecting and doing an ohm check - anything but an open or infinity reading usually means it is good. The last item is the defrost thermostat which is located near the evaporator (P/N: 12001937). It can also be checked with an ohm meter and the normal readings are 28-48 ohms.
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