Product review (5 stars): Fixed our defrost problems
I also had problems with ice buildup on the evaporator went through some troubleshooting steps to find the thermistor on the evaporator was out of spec when tested at specified conditions (15~16-kOhms @ 32F; 4~5-kOhms @ room temp). Replaced with this item and everything works again, be sure to fully defrost the evaporator before putting back into service.

Installed on GE Profile Artica PSS25SGNA BS