Microwave displays E19 and makes a 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: This symptom involves the high-voltage system, which is extremely dangerous. Do not attempt internal repairs unless you are a qualified technician.
User-level action:
- Immediately stop using the microwave and unplug it.
- Do not attempt repeated starts; this can damage additional components.
Technician-level steps:
- Discharge the high-voltage capacitor safely.
- Test the magnetron for shorts to ground and proper resistance.
- Check the HV diode and capacitor for shorts.
- Inspect the HV transformer for signs of overheating or winding shorts.
Replace any shorted component with Summit-approved high-voltage parts. Due to the risk, most homeowners should replace the entire microwave or hire a professional.