Tim M Jefferson City , MO November 06, 2015 Appliance: Whirlpool Dryer GEW9200LW0 Whirlpool Dryer Gew9200lw0: Fresh food compartment not defrosting. How to replace Temperature Sensor (Thermistor Assembly). I bought a new asm temp sensor it was cheep and easy to fix. The local appliance guy told me I would need a new mother board for $600 plus dollars installed. Turns out the motherboard is working fine. 6 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes