dE
Tristar Door Open Detection Error

Microwave displays dE or DE and will not start; often accompanied by a door-open icon.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Misadjusted door latch, Faulty door interlock switch, Broken door hook, Loose door switch wiring

How to Fix / Troubleshooting

Safety: Unplug the microwave before accessing door switches.

Steps to address dE/DE:

  • 1. Check door alignment: Ensure the door closes flush with the cabinet and the latch hooks fully engage. Look for cracks or breaks in the plastic hooks.
  • 2. Clean door area: Wipe the door frame and latch area to remove food debris that may prevent full closure.
  • 3. Listen for switch clicks: Slowly close the door and listen for 2–3 distinct clicks from the interlock switches. Missing clicks suggest a failed or misaligned switch.
  • 4. Access and test switches: Remove the outer cabinet, locate the interlock assembly, and test each switch with a multimeter for proper open/closed operation as the door moves. Replace any defective switch.
  • 5. Inspect latch bracket: If the plastic interlock bracket is loose or cracked, replace it to restore proper switch alignment.
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Repair Difficulty

Medium 3/5

Required Part

Door Latch and Interlock Switch Assembly
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