2183400 AP6005994 PS11739056 Refrigerator Defrost Timer for WhirlpoolRefrigerator Defrost Timer for Whirlpool Part Number 2183400. 8 Hour, 25 Minute Timer. Every 8 hours this will send the refrigerator into defrost for 25 Minutes. Replacement for numbers 2162044, 2162052, 2183400, AP6005994 and PS11739056.Features of 2183400 AP6005994 PS11739056 Re..