Oster
Convection/grill heater circuit failure
Microwave convection or grill function does not heat, but standard microwave heating works.
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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
Open convection heater element, Failed grill element, Faulty convection fan, Defective heater relay on control board
How to Fix / Troubleshooting
Safety first: Unplug the microwave/oven combo and allow it to cool before inspection.
- Test standard microwave mode: Verify that normal microwave heating works to isolate the issue to the convection/grill system.
- Check for error codes: Some models will show E8, H2, or similar when heater circuits fail.
- Advanced testing: With the cabinet removed, test the heater elements and thermal fuses for continuity. Replace any open components with Oster-compatible parts.
- If elements are good: The control board heater relay or temperature sensor may be faulty and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Convection Heater Element
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