Westinghouse
Start Circuit / Control Logic Fault
Microwave display is on but the START button does nothing; timer does not count down.
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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
Failed START key on keypad,Loose keypad ribbon cable,Control board input failure,Door not detected as closed by interlock circuit
How to Fix / Troubleshooting
Safety first: Unplug before accessing internal components.
User-level steps:
- 1. Confirm door closure: Open and firmly close the door. Look for the "door" or similar indicator on the display if present.
- 2. Try other keys: If other keys respond but START does not, the START key may be faulty.
- 3. Power reset: Unplug for 5 minutes and retry.
Advanced steps:
- 4. Reseat keypad cable: Remove the control panel and reseat the ribbon cable.
- 5. Replace keypad: If the START key remains non-functional, replace the membrane keypad.
- 6. Check door switches: If the control does not detect the door as closed, test and replace faulty door switches.
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Repair Difficulty
Medium
3/5
Required Part
Membrane Keypad
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