Tristar Unresponsive Membrane Keypad

Microwave keypad buttons do not respond or require very hard pressing; no error code displayed.

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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

Worn membrane contacts, Moisture ingress behind keypad, Damaged keypad ribbon cable, Faulty control PCB keypad interface

How to Fix / Troubleshooting

Safety: Unplug the microwave before removing the control panel.

Steps to fix unresponsive keypad:

  • 1. Power reset: Unplug for a few minutes and test again to rule out a temporary control glitch.
  • 2. Inspect keypad surface: Look for cracks, bubbling, or signs of liquid damage. If present, the keypad likely needs replacement.
  • 3. Access and reseat ribbon: Remove the control panel and reseat the keypad ribbon cable on the control board.
  • 4. Replace keypad: If specific keys or the entire pad remain unresponsive, replace the membrane keypad or full control panel assembly with a Tristar-compatible part.
  • 5. Control board check: If a new keypad does not resolve the issue, the control PCB may be defective and require replacement.
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Repair Difficulty

Medium 3/5

Required Part

Membrane Keypad
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