Westinghouse
Power Supply Sag / Loose Connection
Microwave clock and display reset randomly or flicker when cooking starts.
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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 at terminal block,Failing line filter board,Weak internal low-voltage power supply,Loose neutral or ground connection
How to Fix / Troubleshooting
Safety first: Unplug the microwave before inspecting internal wiring.
User-level steps:
- 1. Test outlet: Use a different outlet on a dedicated circuit to rule out house wiring issues.
- 2. Avoid extension cords: Plug directly into the wall.
Advanced steps:
- 3. Inspect cord connection: Inside the unit, verify the cord is securely attached to the terminal block or line filter board.
- 4. Check line filter: Look for burnt components or loose spade connectors.
- 5. Replace control board: If the low-voltage supply is unstable, the main control board may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Line Filter Board
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