Owner help
The fire alarm panel shows a BDA trouble signal. Here is what to do.
A BDA trouble or supervisory signal means the radio system has reported a problem with its power, battery, antennas, amplifiers or its link to the fire alarm (IFC 2021 510.4.2.5). Write down the exact message and time, call your BDA service vendor and your monitoring company the same day, and do not silence it and move on. Low battery and donor antenna signals are the most urgent, because the system may already be down or close to it.
What the panel is telling you
A BDA system watches itself. When something goes wrong, it must send a signal to the fire alarm system, which shows it on the panel as a trouble or supervisory condition (IFC 2021 510.4.2.5; NFPA 1225 18.14.1.1). Many buildings also have a small dedicated annunciator panel for the BDA in the fire command center (NFPA 1225 18.14.2.1).
Where the fire code official approves it, all the BDA signals may arrive on one supervisory input (NFPA 1225 18.14.1.2(5)), so your panel may just say "BDA trouble." In that case the dedicated annunciator, or the vendor, tells you which one it is. How the system works end to end is on how a BDA system works.
What each signal means
The model fire code lists eight signals the system must report (IFC 2021 510.4.2.5). Here is what each one usually means for you.
| Signal | IFC 2021 510.4.2.5 | What it usually means | How urgent |
|---|---|---|---|
| Loss of normal AC power | Item 1 | The system is running on battery; the clock is running | Same day |
| Battery charger failure | Item 2 | The battery will not recharge after an outage | Same day |
| Donor antenna malfunction | Item 3 | The link to the outside radio network is lost or weak | Urgent |
| Active RF-emitting device failure | Item 4 | An amplifier or remote unit has failed | Urgent |
| Low battery capacity | Item 5 | 70 percent of the 12 hour runtime is used (NFPA 1225 18.14.1.2(2)(c)) | Urgent |
| Active system component failure | Item 6 | Another powered part has failed | Same day |
| Fire alarm to BDA link failure | Item 7 | The fire alarm can no longer see the BDA at all | Urgent |
| Oscillation | Item 8 | Feedback between antennas; the booster may cut its gain or shut down | Urgent |
Oscillation matters beyond your building: a booster that feeds back can interfere with the public safety radio system itself. That is why boosters must detect and control it (IFC 2021 510.4.2.4) and why it is checked every year (IFC 2021 510.5.4 item 7).
The first 24 hours
- Write it down. The exact message on the panel and the annunciator, the date and the time.
- Call your monitoring company. Confirm they received the signal, and ask whether their contract covers BDA signals, not only fire alarms.
- Call your BDA service vendor the same day. Give them the exact signal name. If you do not have a BDA vendor, call your fire alarm vendor and ask who services the BDA.
- Look for a cause you can see. A tripped breaker, a building power outage, roof work near the donor antenna, or new construction near indoor antennas.
- Do not silence it and forget it. Silencing the sounder while you make calls is fine. Leaving the trouble open is not. The system is supposed to be kept working at all times (IFC 2021 510.6).
- Ask the fire department how they want to hear about it if the system will be down for more than a short time. Some can require a fire watch until the system works again; Miami-Dade's rule allows that (Miami-Dade County Code Sec. 14-69(C)(3), quoted in the MDFR guideline).
- Log the repair. Date, signal, vendor, what was fixed. The tester will want it at the next annual test.
Repair or replacement?
Most trouble signals end in a repair. A replacement makes sense when the part has failed for good or no longer meets the rules. As a rough guide:
| Signal | Often a repair | Sometimes a replacement |
|---|---|---|
| AC power loss | Reset a breaker, fix the circuit | Rarely |
| Charger failure | Replace the charger | Charger and battery together |
| Low battery | Restore power, recharge | Batteries that fail the 1 hour load test (IFC 2021 510.6.1 item 3) |
| Donor antenna | Re-aim, fix the cable or connector | Damaged antenna |
| Amplifier or component | Reset, replace a module | Amplifier at end of life |
| Oscillation | Restore isolation, adjust gain | Rarely, if the layout cannot be fixed |
Two rules shape the cost. Maintenance done under the code is not a modification and needs no permit, but installing or modifying the system does (IFC 2021 510.3). And in Florida, any modification to an existing system needs the express consent of the radio license holder (F.S. 633.202(18)(d)). Ask your vendor which side of that line their fix falls on before you approve it.
If the trouble came up because the system failed its annual test, see what to do after a failed annual test. For the full monitoring and battery rules, see BDA monitoring. For local rules in your area, see ERRCSCheck.
A note on who we are
BDACheck is a private company, not the fire department or a monitoring company. We cannot clear a signal or tell you a system is safe. Your vendor and your fire marshal can.
If you need a vendor, the form below sends your request to up to 3 licensed installers who serve your area. They contact you by email, or by phone only if you choose calls.
Free for owners, boards and managers
Get up to 3 quotes to clear the trouble signal
About two minutes. Tell us about the system and the deadline; testers who already work with your fire department reply.
- Your request goes to no more than 3 licensed installers or testers who work in your county.
- They write to you by email. They call only if you pick phone calls on the form.
- Nobody sends you text messages or robocalls, and your details are never sold to a list.
- Free for building owners and managers. The installers pay BDACheck for each introduction.
- No installer in your area? We say so within 2 business days and send what your local rules ask for.
BDACheck is a private company, not a government agency or fire department.
Request received
Thank you. Up to 3 licensed installers who serve your area will contact you, usually within 2 business days.
Free test reminder
Never miss the next BDA test
Add your building once and we email you before the next test is due. It is free, and setting a reminder never shares your details with an installer. Need a new system or a repair? Ask ERRCSCheck for up to 3 quotes.
Questions people ask
Can we just silence the BDA trouble and wait for the annual test?
No. Silencing the sounder at the panel is fine while you make calls, but the problem is still there. The code expects the system to be kept working at all times (IFC 2021 510.6), and a BDA that is down means firefighters may not be able to use their radios inside the building.
How long does the battery last once AC power is lost?
The system must be able to run 12 hours at full load on backup (IFC 2021 510.4.2.3; NFPA 1225 18.13.2). The low battery signal comes when 70 percent of that 12 hours is used (NFPA 1225 18.14.1.2(2)(c)), which leaves under four hours. Treat it as urgent.
Who is supposed to respond to the signal?
The codes say the signal must reach the fire alarm system (IFC 2021 510.4.2.5; NFPA 1225 18.14.1.1). Who responds is often set locally. In Miami-Dade, signals go to a central station or the contracted radio service provider, and a runner must be on site within four hours (Miami-Dade County Code Sec. 14-69, quoted in the MDFR guideline).
The trouble comes and goes. Does that matter?
Yes. A signal that clears on its own is still a sign something is wrong, such as a failing battery, a loose connection or oscillation that comes and goes. Log every time it appears and give the log to your vendor.
Sources
Primary documents we read for this page. Rules change; confirm with your fire marshal (AHJ).
- International Fire Code 2021, Section 510 (text as published by the City of Eaton), City of Eaton, reproducing the ICC International Fire Code
- NFPA 1225, Standard for Emergency Services Communications, 2022 Edition: Chapter 18 and section 20.3.10, Georgia Office of Insurance and Safety Fire Commissioner (reproducing NFPA text)
- General Guidelines for the Deployment of Two-Way Radio Communication Enhancement System (BDAs), Miami-Dade County Fire Prevention Division
- Florida Statutes 2026, section 633.202, subsection (18), The Florida Senate
Related
Something is up with your building's BDA system. Start here.
Next steps for owners and managers when the annual BDA test is due, the test failed, or the fire alarm panel shows a BDA trouble signal.
How a BDA system is monitored, and what to do when it alarms
The trouble signals a BDA must send to the fire alarm, the 12-hour battery rule and the annunciator panel, from NFPA 1225 and IFC 510, with a response plan.
Your BDA failed its annual test. Here is the plan.
Read the deficiency list, sort repairs from upgrades, handle the permit and radio license consent, re-test and tell the fire department, step by step.
Five ways a BDA system fails, and how each gets fixed
Five BDA / ERRCS failures the fire codes test for - weak batteries, oscillation, a moved donor antenna, renovations, radio system changes - with causes and fixes.
Your building's BDA system, explained for the people who run it
What the BDA in your electrical closet does, what each part is, who else has a say over it, and the five jobs that fall to the building or facilities manager.