The door interlocks are a safety feature; a latch fault disables the unit entirely.
Inspect the Latch Hooks
The plastic hooks on the door can crack or stick.
Fix: Examine them for damage; a broken latch assembly should be replaced.
Clear the Latch Recess
Debris in the latch slots stops the hooks from engaging.
Fix: Clean out the recesses on the cabinet.
Door Switch Alignment
Misaligned interlock switches read the door as open.
Fix: A technician realigns or replaces the switch stack.
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