Carte mère de l'unité extérieure 18 De Dietrich 769439200

The main board outdoor unit 18 controls the outdoor section of your heating system, managing compressor operation and fan speed. It interprets signals from the indoor unit and sensors to maintain optimal performance. If your system fails to heat or displays outdoor unit errors, this board may be the culprit. As a vital boiler spare part, it ensures seamless communication between indoor and outdoor components.