Neil M Chicago , IL December 19, 2016 Appliance: Maytag Refrigerator A4TXNWFWW01 Maytag Refrigerator A4txnwfww01: It was the thermostat. How to replace Refrigerator Temperature Control Thermostat. Disconnected the old one from the defrost timer and reconnected the new one according to the numbers on each part. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes