When a Whirlpool residential dishwasher door refuses to close or latch shut securely, the malfunction is typically caused by a broken plastic latch hook, a misaligned upper strike receiver, a broken spring inside the catch mechanism, or shifting cabinet mounting brackets. Slamming the door over time can snap plastic retaining fingers. You can troubleshoot door latches easily using a screwdriver. You can verify that your corrective action is successful when inspecting the latch assembly, tightening loose mounting brackets, clearing out food debris, or replacing a broken OEM latch component allows the door to click firmly into place and engage the safety microswitch.
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