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DIAGNOSTIC LED ACTIVE: 4100ES Trouble Code | Fire Alarm Resource Center
DIAGNOSTIC LED ACTIVE
trouble
Simplex 4100ES
101 views
What This Code Means
The system diagnostic LED is currently active, indicating a diagnostic process is running or a hardware fault is being signaled.
Common Causes
1
Active diagnostic test
2
Hardware fault
3
System startup sequence
Resolution Steps
Check the diagnostic logs to identify the specific test or fault and clear any active diagnostic modes.
Manual References
(3)
1
simplex
4100ES Fire Control Units
Datasheet
2025
Open
2
simplex
4100ES
Programming
2011
Open
3
simplex
4100ES
Installation
2017
p. 12
Open
Getting DIAGNOSTIC LED ACTIVE on your 4100ES?
Ask TroubleShooter AI for help
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Field Notes
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Related Codes
Output Abnormal
An output circuit, such as a NAC, is not in its expected electrical state.
No Answer/Bad Answer
A programmed device is either not responding or is sending invalid data to the panel.
Extra Device
A device is responding at an address that has not been programmed into the system configuration.
Class A Trouble
A break in the wiring has occurred on a Class A (Style 6 or 7) circuit.
RECURRING TROUBLE FILTER ACTIVATED
The system has activated a filter to suppress recurring intermittent trouble signals to prevent nuisance notifications.
Related Questions
What does 'IDNet Extra Device' trouble mean on the 4100ES and how do I resolve it?
How do I troubleshoot a ground fault on the Simplex 4100ES using the Earth Fault Search?
What is IDNet and how does it differ from other SLC protocols like FlashScan or Signature?
DIAGNOSTIC LED ACTIVE
trouble
Simplex 4100ES
101 views
What This Code Means
The system diagnostic LED is currently active, indicating a diagnostic process is running or a hardware fault is being signaled.
Common Causes
1
Active diagnostic test
2
Hardware fault
3
System startup sequence
Resolution Steps
Check the diagnostic logs to identify the specific test or fault and clear any active diagnostic modes.
Manual References
(3)
1
simplex
4100ES Fire Control Units
Datasheet
2025
Open
2
simplex
4100ES
Programming
2011
Open
3
simplex
4100ES
Installation
2017
p. 12
Open
Getting DIAGNOSTIC LED ACTIVE on your 4100ES?
Ask TroubleShooter AI for help
→
Field Notes
Loading field notes...
Sign in
to share a field note
Related Codes
Output Abnormal
An output circuit, such as a NAC, is not in its expected electrical state.
No Answer/Bad Answer
A programmed device is either not responding or is sending invalid data to the panel.
Extra Device
A device is responding at an address that has not been programmed into the system configuration.
Class A Trouble
A break in the wiring has occurred on a Class A (Style 6 or 7) circuit.
RECURRING TROUBLE FILTER ACTIVATED
The system has activated a filter to suppress recurring intermittent trouble signals to prevent nuisance notifications.
Related Questions
What does 'IDNet Extra Device' trouble mean on the 4100ES and how do I resolve it?
How do I troubleshoot a ground fault on the Simplex 4100ES using the Earth Fault Search?
What is IDNet and how does it differ from other SLC protocols like FlashScan or Signature?
