Whirlpool Dishwasher Lower Spray Assembly and Shield (WPW10491331) (Replaces W10837249)

The lower start switch and shield assembly is the control component that initiates your dishwasher's wash cycle when the door is fully closed and latched. It works by completing an electrical connection that signals the control board to begin operation, while the shield protects the switch mechanism from moisture and heat inside the dishwasher cavity.

Important Compatibility Note: Part number WPW10491331 is the current manufacturer-approved replacement for the following discontinued part number(s): W10837249. If your appliance documentation or old part uses any of these numbers, this is the correct, updated component for your repair.

This assembly can fail from repeated use wearing down the switch contacts, exposure to moisture causing corrosion, or physical damage to the shield that leaves the switch unprotected. Heat and detergent vapor inside the dishwasher can also degrade the switch over time, eventually preventing it from making a reliable electrical connection.

If you are experiencing any of the following symptoms, this assembly may need to be replaced:

- Dishwasher does not start when the door is closed and the cycle is selected

- Cycle starts inconsistently or only after pressing the door firmly multiple times

- Dishwasher stops mid-cycle for no apparent reason

- Control panel shows no response even though the unit has power

- Door feels properly latched but the dishwasher still will not run

- Visible cracking, melting, or damage around the switch or shield area

- Error code related to door sensing or cycle start appears on the display