Safety: Unplug the microwave before removing the cabinet.

Steps to address E8:

1. Confirm fan operation: During normal cooking, you should hear the cooling fan. If the microwave shows E8 and you do not hear the fan, suspect a fan issue.
2. Access fan motor: Remove the outer cabinet. Locate the cooling fan assembly, typically near the magnetron and high-voltage transformer on Tristar units.
3. Inspect for obstructions: Check for insulation, plastic, or debris caught in the fan blades. Remove any obstructions and ensure the fan spins freely by hand.
4. Check wiring: Verify the fan motor connector is firmly attached and wires are not damaged.
5. Test fan motor: With the unit unplugged, disconnect the fan motor and test for continuity across its terminals. An open circuit indicates a failed motor that must be replaced.
6. Replace fan motor if needed: Install a compatible Tristar cooling fan motor, secure it properly, reconnect wiring, and reassemble the cabinet. Test operation. If E8 persists with a known-good fan, the control PCB may not be powering the fan and should be evaluated by a technician.

Microwave shows E8 and stops heating; fan may continue to run briefly.

Possible Causes