Microwave shows E13 and sensor cooking functions (e.g., auto reheat) do not work properly.

How to Fix / Troubleshooting

Safety first: Unplug the microwave before accessing the control area.

User-level steps:

1. Clean the cavity: Wipe down the interior, especially near the sensor port (often on the top or side wall). Grease and food splatter can affect sensor readings.
2. Avoid covering vents: Ensure you are not covering the sensor area with plastic wrap or lids during sensor cooking.

Advanced steps:

3. Locate humidity sensor: Typically mounted near the top of the cavity or behind a small grill.
4. Inspect and clean sensor port: Gently clean around the sensor opening with a soft cloth and mild cleaner.
5. Check wiring: Verify the sensor harness is firmly connected to the control board and sensor.
6. Replace sensor: If E13 persists, replace the humidity sensor with the correct Westinghouse part.

If sensor replacement does not resolve the issue, the main control board may be at fault.