SE
Tristar Keypad Short / Stuck Key Error

Microwave beeps continuously or intermittently and displays SE; some keys may appear stuck.

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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

Shorted membrane keypad contacts, Moisture or cleaning fluid inside keypad, Damaged keypad ribbon cable, Faulty control PCB keypad scan circuit

How to Fix / Troubleshooting

Safety: Unplug the microwave before working on the control panel.

Steps to address SE:

  • 1. Unplug to stop beeping: Disconnect power to stop the beeping and prevent further damage.
  • 2. Dry the keypad: If SE appeared after cleaning, leave the unit unplugged for several hours to allow moisture to evaporate. Do not spray cleaners directly on the keypad; apply to a cloth instead.
  • 3. Inspect keypad and ribbon: Remove the control panel and check the keypad ribbon cable for corrosion, kinks, or damage. Reseat the cable on the control board.
  • 4. Test keypad function: After reassembly, plug in and test each button. If SE returns or certain keys do not respond, the membrane keypad is likely defective.
  • 5. Replace keypad assembly: Install a new Tristar membrane keypad or full control panel assembly as specified for your model. If a new keypad does not resolve SE, the control PCB must be replaced.
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Repair Difficulty

Medium 3/5

Required Part

Membrane Keypad
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