Microwave shows E17 and makes a loud humming noise without heating.
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.
Possible Causes
How to Fix / Troubleshooting
Critical safety warning: The high-voltage system is extremely dangerous. Do not attempt to service HV components unless you are trained and equipped to safely discharge the capacitor.
User-level action:
- 1. Stop using the microwave: Unplug immediately if you hear loud humming with no heating or see E17. Continued use can cause further damage or fire.
Technician-level steps:
- 2. Inspect HV components: With the cabinet removed and capacitor safely discharged, inspect the transformer, capacitor, diode, and magnetron for burn marks or damage.
- 3. Test HV capacitor and diode: Use appropriate test methods to check for shorts.
- 4. Test magnetron: Check for shorts to ground and proper filament resistance.
- 5. Replace failed components: Replace any shorted HV parts with Westinghouse-approved replacements.
Due to the risk of electric shock, this repair should be performed by a professional.
Repair Difficulty
Required Part
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