Unit Shutdown Due to Smoke alarm

What does Unit Shutdown Due to Smoke mean?

This alarm is triggered when the 24 VAC power supply to the SDR input terminal on the SEC board is lost. This input is typically connected to a smoke detector circuit.

• Loss of 24 VAC from the SD24 output
• Problem with the wiring to the smoke detector
• Faulty smoke detector
• Interruption in the circuit to the SEC board's SDR terminal

Click steps to track your progress.

1. 1

   Check the SD24 output for 24 VAC.

2. 2

   Trace the circuit from the SD24 output to the SEC board's SDR terminal to find where power is lost.

3. 3

   Ensure smoke detectors and any associated wiring are functioning correctly.

4. 4

   If the circuit appears intact and power is lost, there may be an issue with the SEC board.