Residential appliance door latches and interlock mechanisms fail over time due to a combination of mechanical wear, structural stress, and environmental buildup. Common causes include repeated forceful slamming that cracks the plastic housing or snaps internal spring-loaded fingers, extreme heat warping from self-cleaning oven cycles, caked-on food grease and residue that gum up the moving latch levers, or electrical microswitch failures caused by moisture infiltration and normal spark erosion. You can troubleshoot latch failures safely using a digital multimeter. You can verify that your corrective action is successful when cleaning out grease, tightening mounting brackets, or replacing a broken plastic latch assembly restores reliable locking action and electrical continuity.
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