Bosch
Convection / Grill Heating Failure (Combination Models)
Microwave combination or convection modes do not heat, but standard microwave mode 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 heating element, Failed grill element, Faulty convection fan, Defective mode relay on control board
How to Fix / Troubleshooting
Safety: Unplug the microwave and allow it to cool before inspection.
- Test each mode: Try convection-only and grill-only modes separately. Note which one fails to heat.
- Observe elements: Through the door, check if the grill element glows red after a few minutes in grill mode. If not, the element or its circuit may be faulty.
- Listen for convection fan: In convection mode, you should hear the fan. If silent, the fan motor may be defective.
Next step: Heating elements and convection fans are behind the cavity walls and require disassembly. Contact a Bosch technician for repair.
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Repair Difficulty
Hard
4/5
Required Part
Convection Heating Element
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