E8
Oster
Convection or grill heater overheat / sensor fault
Microwave displays E8 and stops; may occur when using convection or grill functions on combo models.
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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
Failed convection temperature sensor, Open thermal fuse on convection heater, Blocked convection fan, Faulty convection heater element
How to Fix / Troubleshooting
Safety first: Unplug the microwave/oven combo. Internal components can be very hot after use.
- Allow full cool-down: Let the unit cool for at least 45–60 minutes, then plug back in and test. Overheat protection may reset after cooling.
- Check airflow: Ensure rear and top vents are not blocked. Remove any items stored on top of the microwave that could trap heat.
- Inspect convection fan (if accessible): On some Oster models, you can see the convection fan through the rear interior cover. Start a convection cycle and verify the fan spins. If it does not, the fan motor or its wiring may be faulty.
- Advanced checks: With the cabinet removed and power disconnected, test the convection heater thermal fuse and temperature sensor for continuity and proper resistance. Replace any open components with Oster-specified parts.
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Repair Difficulty
Professional Required
5/5
Required Part
Convection Temperature Sensor
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