Sensor alarm 740 — External temperature sensor BT84 fault

What does 740 mean?

This alarm indicates a fault with the external temperature sensor, BT84, connected to the SMO 20. The system relies on this sensor for accurate outdoor temperature readings.

• Damaged or faulty BT84 sensor.
• Loose or corroded wiring to sensor BT84.
• Incorrect placement or installation of BT84.

Click steps to track your progress.

1. 1

   Visually inspect the BT84 sensor and its wiring for any signs of damage or loose connections.

2. 2

   Ensure the sensor is correctly installed and positioned according to the SMO 20 installation manual.

3. 3

   If the sensor appears faulty or the problem persists, contact a service technician for replacement.