Tristar Intermittent Power Loss / Control Reset

Microwave clock resets or the unit restarts randomly during cooking.

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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

Loose power cord connection, Failing line filter board, Intermittent main fuse contact, Faulty control PCB power supply

How to Fix / Troubleshooting

Safety: Unplug the microwave before inspecting internal components.

Steps to troubleshoot resets:

  • 1. Check outlet and plug: Ensure the plug fits snugly in the outlet. Avoid using loose or worn outlets.
  • 2. Inspect power cord: Flex the cord gently while the unit is off; if you see damage or if movement causes power loss, replace the cord.
  • 3. Internal inspection: Remove the cabinet and inspect the line filter board, main fuse holder, and wiring for loose connections or burn marks. Tighten or repair as needed.
  • 4. Control board: If all connections are solid but resets continue, the control PCB's low-voltage supply may be unstable and require replacement.
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Repair Difficulty

Medium 3/5

Required Part

Line Filter Board
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