Bosch residential dishwashers do not feature an electronic software reset for the door latch because the latch assembly operates via a purely mechanical hook and an electrical microswitch. If your Bosch dishwasher door refuses to latch or register as closed, the problem is mechanical or electrical. You can troubleshoot door switch continuity easily using a digital multimeter. You can verify that your corrective action is successful when unplugging the unit, inspecting the plastic latch mechanism for breakage, ensuring the strike aligns with the tub receiver, and replacing a faulty microswitch restores proper mechanical latching and allows the appliance to run.
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