Viking
Start Circuit / Door Interlock Fault
Microwave has power and display works, but pressing START does nothing; no relay click, no fan or light.
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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
Faulty door switch not signaling closed, Failed START button on keypad, Defective control board relay, Broken door latch mechanism
How to Fix / Troubleshooting
Safety: Disconnect power before accessing door switches or control panel.
- Door check: Ensure the Viking microwave door closes firmly and that the door icon (if present) on the display indicates closed.
- Try different keys: Confirm that other keys respond (time setting, clock). If only START is unresponsive, the keypad may be failing.
- Listen for clicks: When closing the door, listen for multiple distinct clicks from the door switches. Missing clicks suggest a failed or misaligned switch.
- Inspect door switches: Remove the control panel to access the door switch assembly. Replace any worn or burned Viking door switches and ensure the latch lever actuates them correctly.
- Keypad/control board: If door switches are good, the START key circuit or control board relay may be defective. Replace the keypad/control panel or main control board as indicated by testing.
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Repair Difficulty
Medium
3/5
Required Part
Door Switch Assembly
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