Roper Dishwasher WU4300B0 Won't start or doesn't start

The Latch Switch Kit, an OEM Replacement Part is designed to ensure the safe operation of your Whirlpool dishwasher. The kit includes two microswitches and a wiring harness. It prevents the appliance from running when the door is open. If defective, the door switch may prevent the dishwasher from operating even when the door is closed.

Causes of a bad door switch can include wear and tear, exposure to moisture, or a broken actuator.

Symptoms of a bad door switch include:

• Dishwasher not starting
• Dishwasher stopping mid-cycle
• Error codes related to door issues
• Dishwasher running with the door open

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

This thermal fuse protects your appliance by opening the circuit if temperatures climb beyond a safe limit, helping prevent wiring or control damage. When it blows, the unit may lose all power or stop mid-cycle. What it does:

• Cuts power when overheating is detected to protect internal components
• Helps prevent damage from shorted heaters, motors, or wiring faults
• Common symptoms: no power, won't start, shuts off during operation, no lights/display
• A blown fuse reads open (no continuity) and must be replaced—it is not resettable

• 1 thermal fuse

• Disconnect power before servicing to avoid electrical shock
• Access the fuse location per your model's service information; note wire orientation and mounting
• Replace one-for-one; do not bypass or up-rate the fuse. Identify and correct the overheating cause before restoring power.

The Latch Bolt is an OEM replacement part for Whirlpool dishwashers. This component is essential for securing the dishwasher door during operation, ensuring that it remains tightly closed to prevent water leaks and allow the dishwasher to run properly. The latch bolt engages with the door latch assembly, creating a secure seal.

Causes of a bad latch bolt can include regular wear and tear, damage from forceful closing of the dishwasher door, or misalignment that affects the latch's engagement.

Symptoms of a bad Latch Bolt include:

• The dishwasher door not staying closed
• Water leaking from the door during operation
• Difficulty in latching or unlatching the door
• The dishwasher not starting because it detects an open door

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

For black lever order WP3369457. For white use WP3369457. For biscuit use 3375062