Twelve service calls a fire alarm technician actually gets — written up as articles with the full step-by-step solution, key takeaways and the NFPA 72 sections behind each decision. Every scenario is also playable in the interactive Troubleshooting Lab.
Trouble / Fault · Beginner
Step-by-step fire alarm ground fault troubleshooting on a conventional panel: split panel vs. field, isolate the IDC, find the damaged cable, prove the fix.
Read the case studyTrouble / Fault · Intermediate
Troubleshoot a fire alarm NAC OPEN trouble when horn/strobes go silent: bracket the fault with the last working appliance, check terminals and T-taps, re-test.
Read the case studyTrouble / Fault · Advanced
Diagnose an addressable device that drops off the SLC after rain: moisture, corroded terminals, isolator modules and loop diagnostics, with NFPA 72 references.
Read the case studyTrouble / Fault · Beginner
Fire alarm panel showing AC FAIL and LOW BATTERY? Check the dedicated branch circuit, test batteries and charger, and size standby per NFPA 72 Chapter 10.
Read the case studyTrouble / Fault · Intermediate
Find the cause of a recurring smoke detector nuisance alarm: event history, sensitivity readings, airflow and environment, plus NFPA 72 Ch. 17 placement rules.
Read the case studySupervisory · Beginner
Valve tamper supervisory on a sprinkler riser: verify the control valve position, inspect the tamper switch, and document the call per NFPA 72 and NFPA 25.
Read the case studySupervisory · Intermediate
Sprinkler waterflow alarm with no fire and no water? Check the flow switch, retard setting, pressure surges and inspector's test, with NFPA 72/25 references.
Read the case studySupervisory · Advanced
Low air supervisory on a dry pipe sprinkler system in freezing weather: compressor, air maintenance device, leaks and trip risk, with NFPA 72, 13 and 25 refs.
Read the case studySupervisory · Advanced
Fire pump running but no signal on the fire alarm panel? Verify pump controller contacts, pressure settings and NFPA 72 / NFPA 20 supervisory monitoring rules.
Read the case studySupervisory · Intermediate
Duct smoke detector activates but the air handler keeps running: trace supervisory vs alarm programming, relay and fan shutdown per NFPA 72 Ch. 21 and NFPA 90A.
Read the case studyTrouble / Fault · Advanced
Phase I elevator recall fails on test: check lobby, machine room and hoistway detectors, relay programming and the controller per NFPA 72 Ch. 21 and ASME A17.1.
Read the case studySupervisory · Advanced
Pre-action sprinkler low air supervisory plus a releasing panel trouble: supervisory air, detection and releasing circuit supervision, with NFPA 72/13 refs.
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