Whirlpool Refrigerator EHT171TKWR3 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 cold control thermostat regulates your refrigerator's temperature by cycling cooling on and off based on air temperature at the sensing bulb. Replacing a worn control restores accurate settings and consistent cooling performance. What it does:

• Monitors compartment temperature via a capillary sensing bulb
• Opens/closes electrical contacts to start and stop the compressor (and related cooling circuits)
• Helps maintain the temperature you set on the control dial
• Failure symptoms include: unit too warm or too cold, runs continuously, won't start until the knob is moved/tapped, or erratic temperature swings

• 1 thermostat

• Disconnect power before servicing; wear cut-resistant gloves
• Note wire positions or take a photo; transfer the dial/shaft and any mounting hardware from the old control if reused
• Route the capillary bulb exactly as original; do not kink, pinch, or cut it; secure with existing clips
• After install, set to a mid setting and allow up to 24 hours for temperatures to stabilize