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Fire Alarm Resource Center

Panels, trouble codes, Q&A, and specs. Everything a fire alarm technician needs in one place.

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Trending

What does 'KEY BUS TROUBLE' mean on the 5820XL and how do I resolve it?
QuestionSilent Knight 5820XL Answered 264
How do I program the Silent Knight 6820 via the USB interface, and what software is required?
QuestionSilent Knight 6820 Answered 258
CHECK or TRBL 974
Trouble CodeHoneywell VISTA-128FBP 216
I'm getting CHECK or TRBL 974 on my Honeywell VISTA-128FBP. What should I check?
QuestionHoneywell VISTA-128FBP Answered 209
4009 NAC Power Failure
Trouble CodeSimplex 4010ES 208
I'm getting 972 Earth Ground Fault on my Honeywell VISTA-128FBP. What should I check?
QuestionHoneywell VISTA-128FBP Answered 196
What is the maximum SLC loop and device capacity of the NFS2-3030, and how does it expand beyond one loop?
QuestionNotifier NFS2-3030 Answered 193
Cellular Card No Connectivity
Trouble CodeNotifier N16 186

Latest Questions

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what is a simplex 2004fs panel for?
Simplex 2004FSMay 19, 2026
I'm getting NO POWER SUPPLY INST on my Notifier NFS2-3030. What should I check?
Notifier NFS2-3030May 19, 2026
I'm getting 4009 NAC Power Failure on my Simplex 4010ES. What should I check?
Simplex 4009, 4010ESMay 18, 2026
How many 4009-9601 can connect to 4100ES Panel?
Simplex 4009-9601, 4100ESMay 16, 2026
What are the main differences between the NFS-3030 and the NFS2-3030?
Notifier NFS-3030, NFS2-3030May 15, 2026
What are the main differences between the NFS-640 and the NFS2-640?
Notifier NFS-640, NFS2-640May 15, 2026
Is the Honeywell TC806D1049 Photoelectric Duct Smoke a 2 wire or a 4 wire?
Honeywell TC806D1049Apr 21, 2026
What is the battery fail trouble code for the LSS4?
Edwards Est LSS4Apr 13, 2026
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