Douglas Krantz - Technical Writer - Describing How It Works
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How Can I Clear the Trouble Tone?

How can I clear the Trouble Tone?


Greetings Douglas,

I have the following trouble message on a Siemens Fire Finder XLS:

DLC @ Address 2
Trouble type. Module


The building is not being used because of pandemic. How do I clear this in order to silence trouble tone?

Thank you, G R

The Light is a Warning

The trouble light and trouble tone are on the fire alarm system as a warning: Something's Not Working. As long as something's not working on the fire alarm system, the trouble light is going to stay on.

In order to tell the fire alarm panel that you know there's something wrong with the system, the annoying trouble tone can be silenced . . . but the trouble tone will resound in 24 hours to remind you that there's something wrong with the fire alarm system.

In order to turn off the trouble light and trouble tone, the system has to be fixed.

Fire Alarm System is Not Working

Whenever there's a trouble light showing on a fire alarm system, you can assume that the fire alarm system doesn't work at all.

"DLC @ Address 2, Trouble Type. Module" showing on the display probably indicates that the Digital Loop Controller module on the panel is not working. This module controls a lot of the devices in the building. If there's a fire, there is a good chance that the fire will not be detected until the fire is very big.

Remember, there may not be people in the building due to the pandemic, but as well as for "Life Safety", the fire alarm system is there for "Property Protection". If the fire alarm system isn't working, the building is not being protected.

Technical Support

Talk to Siemens Technical Support to find out what you can do about the trouble. It may be something simple, but then again it may be something expensive, like the Digital Loop Controller.

Check the Circuit Breakers

Just thought of another possibility. I've seen this problem where part of a building is shut down because it's not being occupied at the moment.

Circuit breakers were turned off, which turns off parts of the fire alarm system. Check the circuit breakers. If the circuit breakers were turned off to save money, turning off the circuit breakers could also have shut down part of the fire alarm system.

Douglas Krantz
Based on his electronics training, and his understanding of Life Safety, Douglas Krantz has compiled his knowledge of Conventional Fire Alarm Systems into the book Make It Work - Conventional Fire Alarms. The book covers the basics of the Conventional Fire Alarm System, and shows how Life Safety and internal supervision affects the fire alarm system.

Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer

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