Kitchenaid Refrigerator KFRF19MSWHY1 Won't start or doesn't start

The Whirlpool Defrost Timer is an OEM replacement part for Whirlpool refrigerators. The defrost timer regulates the automatic defrost cycle, which prevents ice buildup on the evaporator coils in the freezer compartment by sending a signal to the defrost heater to turn on and melt any ice buildup on the coils. 

Causes of a bad defrost timer can include mechanical wear over time, electrical failures, or internal component damage. Prolonged usage and voltage spikes can also affect the timer's functionality.

Symptoms of a bad Defrost Timer include:

• Excessive frost buildup in the freezer compartment
• The refrigerator or freezer not maintaining the set temperatures
• Unusual noises coming from the appliance 
• The appliance running continuously without cycling off

This OEM Whirlpool part can also be used on Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore/Sears brand appliances.

This PTC start relay mounts on the compressor and momentarily powers the start winding to get the motor running, then disengages for normal operation. Replacing a weak relay can stop repeated clicking and help restore cooling.

• Provides initial boost to the compressor's start winding for reliable startup
• Automatically drops out after startup so the compressor runs on the run winding
• Helps address symptoms like warm temperatures, compressor clicking or humming without starting, or frequent overload trips
• Failure may show as rattling, burn marks, or a melted relay housing

• Disconnect power and remove the rear access panel to reach the compressor
• Allow components to cool; note wire locations and take a reference photo
• Pull the old relay straight off the compressor pins; align and firmly seat the new relay in the same orientation, then reconnect wires
• If your unit uses a run capacitor and/or separate overload protector, reconnect per the wiring diagram before restoring power