Why is my fire alarm panel showing a fault or buzzing?

Direct answer

A fire alarm panel makes an audible buzzing and shows a fault to alert you to a problem such as a power or battery fault, a detector or circuit fault, or a system event that needs attention. Read the fault shown on the panel display, silence the internal buzzer if appropriate, and record the fault. Do not simply reset or silence a panel repeatedly without identifying the cause; if the fault persists or you are unsure, contact your fire alarm service provider. Refer to the manual for your specific panel for the exact fault indications and procedures.

Applies to

• Products / Models: Hochiki Europe control panels, including the Latitude range (the exact fault indications and controls differ by panel; see your panel manual)

• Firmware / Version: Not applicable

• Region: UK / Europe

• Standards: BS EN 54-2 (control and indicating equipment — fault indications), BS EN 54-4 (power supply equipment), BS 5839-1 (system design, testing and maintenance)

What a fault means for your protection

A fault indication means the system has detected a condition it cannot work around. Depending on the fault, part of the building may no longer be monitored, the sounders may not operate, or an alarm may not reach your alarm receiving centre. Treat the period until the fault is cleared as a period of reduced protection, and consider whether your fire risk assessment calls for interim measures. Under the Regulatory Reform (Fire Safety) Order 2005 (Article 17) the responsible person must keep fire safety equipment under a suitable system of maintenance and in efficient working order.

Common fault indications

• Mains/power fault (loss of mains supply).

• Battery fault (low or disconnected standby battery).

• Detector or circuit fault (open circuit, removed device, short circuit).

• General/system fault requiring attention.

• Earth fault (a single earth fault affecting a mandatory function, often caused by damaged cable insulation or water ingress).

• Sounder or alarm transmission fault (a short circuit or interruption affecting the sounder circuits, or the path to an alarm receiving centre). These indications are not suppressed even during a fire alarm.

• Disablement. This is not a fault: it means someone has deliberately taken a zone, device or output out of service. The panel shows it separately from a fault. Check who disabled it and why, and make sure it is reinstated. See How to disable part of a fire alarm system safely for how a disablement should be authorised, recorded and reinstated.

What to do

1. Read the panel display

   • Note the fault type and any zone, loop or device address shown.

2. Silence the internal buzzer

   • Silencing the buzzer does not clear the fault. The visible fault indication stays until the cause is put right.

   • On many panels the silence control is behind a key or code (BS EN 54-2 allows this), so it may need an authorised person.

   • The buzzer will sound again for each new fault the panel recognises. Repeated re-sounding usually means more faults are appearing, not that the panel is faulty.

3. Record the fault

   • Enter the fault in the system log book with date, time and indication.

4. Address obvious causes only if competent to do so

   • For example, confirm mains supply is present. Do not open the panel or work on wiring unless you are a competent person.

5. Contact your service provider for persistent or unclear faults

   • Battery, detector and circuit faults usually require a competent engineer.

   • BS 5839-1 recommends a 24-hour emergency call-out agreement under which an engineer can normally attend within 8 hours, and that the maintainer's name and telephone number are displayed at the panel.

Do not

• Repeatedly reset or silence the panel to clear a fault without finding the cause. If a reset is needed once the cause is known, see How to reset a fire alarm panel (and what to do first).

• Disable parts of the system to stop a fault indication.

Preventing surprises

• BS 5839-1 recommends that a single, named member of the premises management is appointed to supervise the system, and that this person ensures the panel is checked at least once every 24 hours to confirm there are no faults. A fault found the same day is far easier to resolve than one that has been present for weeks.

• Make sure the people who use the building can tell a fire indication, a pre-alarm and a fault apart, and know who to call (BS 5839-1).

When to contact technical support

• If the fault persists after checking obvious causes.

• For any battery, detector or circuit fault.

Safety note

This article is general guidance for Hochiki Europe products. Design, installation, commissioning, maintenance and modification of fire detection and alarm systems should be carried out by, or under the responsibility of, a competent person in accordance with the applicable standards (for example BS 5839-1 in the UK). Statutory requirements imposed by the relevant enforcing authority also apply. Always refer to the current product manual and data sheet for the exact model before carrying out any work.

References

• Control panel user manual (for exact fault indications and reset procedure)

• System log book

Last reviewed: 2026-10-21 — Reviewed by: Hochiki Europe Technical Support