Microwave displays E2 and stops heating shortly after starting a cook cycle.

Safety first: Unplug the microwave before inspection. Do not operate the unit with covers removed.

• Check ventilation:
  • Ensure the microwave has the required clearance on all sides per the Black+Decker manual (typically several inches at sides, top, and rear).
  • Clean any dust or grease buildup from the rear and side vents.
• Allow to cool: If the unit has been used heavily, let it cool for 30 minutes, then try again. Overheat protection may reset after cooling.
• Inspect cooling fan (for OTR and some countertop models):
  • Remove the outer cabinet.
  • Locate the internal cooling fan near the magnetron.
  • Check that the fan blades spin freely and are not obstructed by debris.
  • If the fan does not run during a cook cycle, the fan motor or control board may be faulty.
• Check cavity temperature sensor:
  • Locate the small sensor or thermostat clipped to the cavity wall or near the waveguide.
  • Visually inspect for damage or discoloration.
  • If you have a multimeter and the specs, test for proper resistance at room temperature. Replace if open or out of spec.

If E2 persists after ensuring proper ventilation and fan operation, the temperature sensor or control board should be replaced by a professional.