F8
Sharp
Cooling fan or overheat protection fault
Sharp oven shows F8 and may not heat or may shut down unexpectedly.
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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 cavity cooling fan motor, blocked cooling air vents, faulty overheat thermostat (thermal cut-out), wiring fault between fan and control board
How to Fix / Troubleshooting
Safety: Disconnect power and allow the oven to cool fully before inspection.
- Check ventilation: Ensure that the oven's front and rear ventilation openings are not blocked by cabinetry, foil, or other obstructions.
- Listen for fan operation: During a bake cycle, the cavity cooling fan should run. If you never hear it, suspect the fan motor or its supply.
- Access fan: Remove the top or rear panel to access the cooling fan. Spin the fan blades by hand; they should move freely. If seized or noisy, replace the fan motor.
- Test fan motor: With power disconnected, measure resistance across the fan motor terminals. An open circuit indicates a failed motor.
- Check thermal cut-out: Locate the overheat thermostat on the top or rear of the oven cavity. Test for continuity. If open and not resettable, replace it.
- Control output: If fan and thermostat are good, the control board may not be energizing the fan relay. Replace the EOC if confirmed.
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Repair Difficulty
Hard
4/5
Required Part
Cavity Cooling Fan Motor
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