Microwave displays E17; loud humming noise when attempting to cook, then stops

Critical safety: High-voltage components can be lethal. Do not attempt to test or replace the transformer, capacitor, diode, or magnetron unless you are qualified.

• 1. Stop using the microwave: Unplug immediately if you hear loud humming and E17 appears.
• 2. Visual inspection: With the cover removed (unplugged), look for burn marks around the transformer, capacitor, and magnetron.
• 3. Smell test: A strong burnt odor from the high-voltage area often indicates a failed magnetron or capacitor.
• 4. Recommended repair: Typically involves replacing the magnetron and high-voltage components as needed. This should be done by a professional technician.