Bosch range oven shows F8 and cooling fan may run continuously or not at all.

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

Failed cooling fan motor, Faulty fan relay on control board, Blocked fan blades, Loose wiring to fan

Safety first: Disconnect power before accessing the rear or top of the range.

Listen for fan: During a bake cycle, the cooling fan should run. If silent, test the fan motor for continuity.
Inspect for obstruction: Check that insulation or wiring is not blocking the fan blades.
Check wiring: Verify the fan connector is secure on both the motor and control board.
Replace fan or control: Replace the cooling fan motor if open or seized. If the fan is good but not powered, the control board relay may be faulty and require replacement.

Hard 4/5

Cooling Fan Motor

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