Oven displays F8 and may not heat or may shut down mid-cycle.

Safety first: Disconnect power at the breaker. Internal metal edges can be sharp; wear cut-resistant gloves.

Step-by-step checks:

• Listen for fan: During operation (before disconnecting), note whether you hear the internal cooling fan running. F8 often appears when the fan does not start.
• Access fan: Remove the top or rear panel (depending on model) to access the cavity cooling fan assembly.
• Check for obstructions: Ensure the fan blades spin freely and are not blocked by insulation, wiring, or debris.
• Test fan motor: With power disconnected, measure resistance across the fan motor terminals. An open circuit indicates a failed motor. If comfortable and safe, you can also apply appropriate mains voltage briefly (using an isolation method) to test spin, but this is best left to professionals.
• Inspect wiring and relay: Check the harness from the fan to the control board for damage. If the fan tests good but never receives voltage, the control board fan relay may be faulty.

When to replace parts: Replace the cooling fan motor assembly if it is open or seized. If the fan and wiring are good, replace the electronic oven control board or have a technician test the relay.