A mechanical "jab" to the door latch can often unstick a sensor.

Modern appliances are essentially computers that occasionally get stuck in a "logic loop." When a cycle won't start or a door won't lock, a series of quick presses—or "jabs"—can force the control board to reboot. Unplug the unit for 60 seconds.

Check if the "Child Lock" or "Control Lock" light is on. Usually, holding a specific button for three seconds will "jab" the system back into an active state. 3. Clogged Filters

A dishwasher that smells or leaves grit on plates usually has a dirty filter. Twist the cylindrical filter at the bottom, rinse it under hot water, and slot it back in. 4. The Float Switch