Display shows F04 and oven cooling fan runs continuously or fails to run when hot.

Safety first: Turn off power at the breaker. The cooling fan is near live mains wiring and hot components.

• 1. Listen for fan operation: With power restored briefly, start a bake cycle and listen for the cooling fan (usually behind the control panel). If it does not run or is very noisy, suspect the fan motor. Turn power off again before proceeding.
• 2. Access fan assembly: Remove the oven from the cabinet and take off the top/rear cover to expose the cooling fan. Check for debris, insulation, or wiring obstructing the blades. Clear any obstructions.
• 3. Spin test: With power off, spin the fan blades by hand. They should rotate freely. If stiff or seized, replace the cooling fan motor assembly.
• 4. Electrical test: Disconnect the fan and measure resistance across the motor terminals. An open circuit indicates a failed motor. Also inspect the wiring harness for heat damage or loose connectors.
• 5. Control board output: If the fan motor tests good but never runs, the control board may not be supplying power. This typically requires board diagnosis and replacement by a technician.

Do not operate the oven for extended periods without a functioning cooling fan, as this can overheat the electronics and surrounding cabinetry.