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The flue sensor cover protects the flue gas sensor from debris, moisture, and mechanical damage, ensuring accurate readings and long sensor life. This cover is designed to fit securely over the sensor, maintaining proper airflow while shielding sensitive components. A damaged or missing cover can lead to sensor malfunction, false error codes, or reduced efficiency. Replacing it with this spare part helps maintain optimal combustion monitoring and safety. Suitable for various boiler and burner models, the flue sensor cover is a simple yet important component for heating system maintenance and repair.