E4
Amana
Overheat Protection / Thermal Cutout Trip
Microwave displays E4 and may shut down or refuse to start, often after extended use.
Advertisements
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.
Advertisements
Possible Causes
Blocked ventilation, Failed cooling fan, Tripped cavity or magnetron thermostat, Defective thermostat stuck open
How to Fix / Troubleshooting
Safety First: Unplug the microwave and allow it to cool completely before further use.
- Check ventilation: Ensure there is adequate clearance around the microwave and that cabinet vents are not blocked.
- Allow cooling: Let the unit sit for at least 30–60 minutes, then plug back in and test.
- Listen for fan: During operation, confirm that the internal cooling fan runs. No fan noise suggests a failed fan motor or control issue.
- Inspect thermostats (advanced): With the cover removed, locate the thermal cutouts on the cavity and magnetron. Test for continuity with a multimeter. Replace any open thermostat that does not reset when cool.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Cavity Thermostat or Magnetron Thermostat
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements