On Toshiba sensor-cook models, E13 appears when starting sensor cooking or reheating; oven may stop after a few seconds.

Safety first: Unplug the microwave before cleaning the interior.

Steps to resolve E13:

• 1. Clean the cavity thoroughly: Food splatter and grease can coat the humidity sensor (usually located on the top or side of the cavity). Clean the interior walls and ceiling with mild detergent and a soft cloth, then dry completely.
• 2. Avoid covering vents: Ensure you are not covering the sensor area or vents with plastic wrap or large containers during sensor cooking.
• 3. Reset the unit: Unplug for 5–10 minutes, then plug back in and test a sensor program with a typical load (e.g., a bowl of room-temperature food).
• 4. Test manual modes: If manual time/power cooking works but sensor modes always trigger E13, the humidity sensor or its circuit is likely defective.

Next step: A technician can access the sensor behind the cavity liner, test its resistance, and replace the humidity sensor or control PCB as needed.