Fire Secure UK
Fire Alarm Response Prioritisation Guide
Introduction
This guide gives a plain-English approach to prioritising fire alarm faults, callouts and remedial works.
It is intended for:
- Service desk teams
- Works coordinators
- Account managers
- Estimators
- Facilities teams
- Building managers
- Non-engineers handling fire alarm reports
The aim is to help decide whether something needs an emergency callout, urgent attendance, a planned visit, or a quoted remedial.
Important note
This page is a practical guide. It is not a replacement for:
- A fire risk assessment
- The building fire strategy
- The maintenance contract
- The site emergency plan
- Competent fire alarm engineering judgement
- Advice from the enforcing authority, insurer, fire engineer or fire risk assessor
Fire alarm systems should be designed, installed, commissioned, maintained and modified by competent people in accordance with the relevant standards, including BS 5839-1:2025 for non-domestic premises.
BS 5839-1:2025 references used in this guide
The key BS 5839-1:2025 references for response prioritisation are:
| Reference | Relevance |
|---|---|
| Introduction | The principal purpose of a fire detection and fire alarm system is to support the fire evacuation strategy for the building. |
| Clause 11 | Covers monitoring, integrity and reliability of circuits external to control equipment. The commentary explains that critical signal paths are monitored so faults are identified quickly and repaired quickly. |
| Clause 14 | Covers communication with the fire and rescue service. The commentary states that in occupied buildings, the primary means of summoning the fire and rescue service is normally a 999 or 112 call by occupants, even where automatic transmission to an ARC is provided. |
| Clause 29 | Covers responsibility for limiting false alarms and unwanted fire alarm signals. |
| Clause 31 | Covers investigation of false alarms and sets thresholds where preliminary investigation is recommended. |
| Clause 42 | Covers routine testing, including weekly testing. |
| Clause 43 | Covers inspection and servicing. |
| Clause 43.2.1 | Recommends inspection and servicing visits at intervals of approximately 6 months. |
| Clause 43.2.2 | Requires the logbook to be examined and outstanding faults reported to premises management for appropriate action. |
| Clause 43.2.4 | Requires false alarm records to be checked and false alarm rates recorded, with further investigation where necessary. |
| Clause 44.2.1 | Where maintenance is carried out by a third party, there should be an agreement for emergency call-out. On a 24-hour basis, a technician should normally be able to attend within 8 hours of a call from the user. |
| Clause 44.2.2 | The name and telephone number of the third party responsible for maintenance should be displayed at the main CIE. |
| Clause 44.2.3 | All faults or damage should be recorded in the logbook, and arrangements should be made for repair as soon as possible. |
| Clause 44.2.4 | Where a defect cannot be rectified during attendance, fault indications should not be concealed. |
| Clause 44.3 | Covers action to address an unacceptable rate of false alarms. |
| Clause 47.1 | Requires premises management arrangements, including checking the CIE for faults where practicable, keeping the logbook up to date, instructing relevant occupants, limiting false alarms and maintaining detector clearances. |
| Clause 48 | Covers the fire alarm logbook. |
The important distinction
BS 5839-1:2025 does not say that every fire alarm fault is automatically an emergency.
It does, however, expect that:
- Faults are identified.
- Faults and damage are recorded.
- Repair is arranged as soon as possible.
- Emergency call-out arrangements exist where third-party maintenance is used.
- A technician can normally attend within 8 hours of the user’s call under those emergency arrangements.
- Fault indications are not hidden if the defect cannot be rectified.
- The user/premises management understands and manages the system properly.
In practice, the urgency depends on what the fault affects.
A single detector fault in a low-risk office is not the same as a dead fire alarm panel in an occupied hotel.
Priority levels
Priority 0 - Actual fire or suspected fire
Response
Immediate emergency action first.
If there is a real fire, signs of fire, smoke, burning smell, sprinkler operation, or credible suspicion of fire, the site should follow its fire procedure and call the fire and rescue service using 999 or 112.
Do not treat an actual or suspected fire as a normal maintenance call.
Once the immediate emergency has been dealt with, and once safe access is permitted, a competent fire alarm engineer should attend to inspect and test the fire detection and fire alarm system.
This is needed to:
- Confirm whether the fire alarm system has been damaged by fire, smoke, heat, water or firefighting activity.
- Confirm whether detection, manual call points, sounders, interfaces and signalling remain operational.
- Check whether any devices, cables or equipment in the affected area need replacement.
- Confirm whether the remainder of the premises still has suitable fire alarm coverage.
- Reset, reinstate or advise on any parts of the system affected by the incident.
- Identify temporary measures needed if any part of the system cannot be reinstated immediately.
- Record findings, defects, disablements and actions in the logbook and service documentation.
Important distinction
The fire and rescue service deal with the emergency incident.
The fire alarm engineer deals with the condition, reinstatement and continued reliability of the fire alarm system after the incident, once it is safe to do so.
Examples
- Fire alarm is sounding and there are signs of fire.
- Smoke is visible.
- Burning smell is present.
- Staff or occupants believe there may be a fire.
- Sprinkler system has operated.
- Fire alarm has activated and no competent person on site can confirm it is false.
- Fire has occurred in one part of the premises and the rest of the building may remain occupied or need to be reoccupied.
- Firefighting activity may have affected detectors, call points, cables, interfaces, sounders or the fire alarm panel.
Suggested priority
Priority 0 for emergency action.
Then:
Priority 1 engineer attendance following the fire, once safe access is available, to inspect/test the system and advise whether it can continue to be relied upon.
Priority 1 - Emergency fire alarm attendance
Suggested response
Emergency callout. Aim for immediate attendance where possible. Under BS 5839-1:2025 Clause 44.2.1, third-party maintenance arrangements should normally allow a technician to attend within 8 hours of a call from the user on a 24-hour basis.
This is the highest maintenance response priority.
Use this priority where the fault may seriously affect life safety, evacuation, warning, detection, fire strategy, or critical fire safety interfaces.
Typical examples
| Issue | Why it is urgent |
|---|---|
| Fire alarm panel dead | The system may not be able to detect, display or process fire alarm signals. |
| System completely inoperative | The building may have no effective fire alarm protection. |
| Sounders not operating in occupied areas | Occupants may not receive warning to evacuate. |
| Major loop failure affecting large areas | Automatic detection, manual call points, sounders or interfaces may be lost. |
| Multiple zones disabled or failed | Significant reduction in protection. |
| Repeated fire alarm activation with no clear cause | May be false alarms, but could also mask a real developing issue. |
| ARC fire signalling failed on a monitored site | Remote fire alarm transmission may be unavailable. |
| Fire alarm outputs to smoke control failed | The building fire strategy may be affected. |
| Fire alarm outputs to lifts failed | Lift recall or lift control may be affected. |
| Fire alarm door release outputs failed | Escape routes, door release or compartmentation strategy may be affected. |
| Fire alarm fault in sleeping-risk premises | Delay in warning sleeping occupants can significantly increase risk. |
| Fire alarm fault in care, healthcare or supported living premises | Occupants may be vulnerable or dependent on staff assistance. |
| Fire alarm fault in a high-rise or phased evacuation building | Alarm strategy and evacuation sequencing may be critical. |
| Battery failure with mains supply concerns | System standby capability may be compromised. |
| Mains failure where standby duration may be exceeded | System may fail once batteries discharge. |
| Water ingress into fire alarm equipment | Risk of faults, false alarms, short circuits or system failure. |
| Fire alarm system disabled for works but building remains occupied | Temporary measures may be needed urgently. |
Practical service-desk wording
Use phrases such as:
“This appears to affect the building’s fire alarm protection and should be treated as an emergency fire alarm callout.”
Or:
“This fault may affect life safety or evacuation arrangements. Engineer attendance should be arranged urgently under the emergency callout procedure.”
Priority 2 - Urgent attendance
Suggested response
Same day or next available engineer, depending on site risk, occupancy and contract SLA.
This is for faults that may not make the entire system inoperative but still affect meaningful protection, monitoring, reliability or compliance.
Typical examples
| Issue | Why it matters |
|---|---|
| Single loop fault but most devices still communicating | The system may still operate, but part of the critical signal path is impaired. |
| Single sounder circuit fault | Warning may be reduced in part of the building. |
| Single detection zone fault on a conventional system | Detection or manual alarm initiation may be lost in that zone. |
| Several devices missing or in fault | Could indicate wiring, water ingress, damage or wider system deterioration. |
| ARC fault where the building is unoccupied outside hours | Property protection or remote response may be affected. |
| Battery fault with mains healthy | System may operate normally now, but standby protection is reduced. |
| Mains fault with batteries currently supporting the system | System may operate only until batteries discharge. |
| Earth fault | System may still operate, but reliability is reduced and further faults may cause greater loss. |
| Intermittent fault | Could worsen or hide a more serious issue. |
| Detector disabled in an important area | Detection has been deliberately removed from part of the building. |
| Output disabled to doors, lifts, plant or smoke control | Fire strategy may be affected depending on the output. |
| Repeated unwanted fire alarms | Needs investigation to reduce false alarm risk and prevent complacency. |
| Pre-alarm or contamination warning affecting multiple detectors | Could indicate environmental issues or developing detector problems. |
Practical service-desk wording
“The system is not reported as fully inoperative, but the fault affects fire alarm protection or reliability. Treat as urgent and arrange attendance as soon as reasonably practicable.”
Priority 3 - Planned repair or routine attendance
Suggested response
Planned attendance within a reasonable timeframe, depending on risk and contract SLA.
This is for issues where the system remains broadly operational and the affected item does not create an immediate significant life safety concern.
However, these are still fire alarm defects. They should not be ignored.
Typical examples
| Issue | Why it can usually be planned |
|---|---|
| Single detector fault in a low-risk area with adequate remaining cover | Limited local effect, but still needs repair. |
| Single device missing where temporary measures are in place | Risk may be controlled short term. |
| Minor text label error | Needs correction, but may not stop the system operating. |
| Non-critical printer fault | Usually does not affect alarm operation. |
| Damaged device cover with device still operational | Needs replacement, but may not affect function immediately. |
| Single remote indicator fault | Main detector may still operate correctly. |
| Single VAD fault where adequate audible warning remains and no specific dependency exists | Needs repair, but urgency depends on the area and occupants. |
| Minor issue identified during service | Can be planned if no immediate impairment exists. |
Practical service-desk wording
“The system appears to remain operational, but a defect has been reported. Arrange a planned repair visit and ensure the issue is recorded.”
Priority 4 - Quotation, improvement or non-urgent remedial
Suggested response
Quote, survey or planned remedial works.
This is for works that are important but are not normally an emergency callout unless the issue also creates an immediate system impairment.
Typical examples
| Issue | Typical handling |
|---|---|
| Additional detector requested | Quote or design review. |
| Additional sounder or VAD requested | Quote or design review. |
| Zone plan update required | Planned update, unless alarm location cannot be understood. |
| Device labelling improvements | Planned remedial. |
| Cause and effect changes requested | Design/commissioning activity, not a casual callout. |
| System extension | Design and quoted works. |
| Upgrade from conventional to addressable | Project/quote. |
| Obsolete panel replacement recommendation | Quote, unless the panel has failed. |
| Repeated environmental false alarms requiring detector type changes | Investigation and remedial proposal. |
| Non-conformity noted during service | Review, advise and quote where appropriate. |
Practical service-desk wording
“This appears to be a quoted remedial or design/change item rather than an emergency fault. Arrange survey or quotation, unless the site confirms an active impairment to the fire alarm system.”
Special cases
Fire alarm panel showing “fire”
A panel showing fire should be treated as a fire alarm condition unless a competent person on site confirms otherwise in accordance with the site procedure.
Do not assume it is false because “it happens all the time”.
Suggested priority
Priority 0 if there is suspected fire. Priority 1 if confirmed unwanted/false but the system requires urgent reset/investigation.
Fire alarm panel showing “fault”
A fault means the system has detected a problem.
It does not always mean the whole system has failed, but it should be investigated and recorded.
Suggested priority
Depends what the fault affects:
| Fault type | Typical priority |
|---|---|
| Panel dead / system inoperative | Priority 1 |
| Major loop fault | Priority 1 or 2 |
| Sounder circuit fault | Priority 1 or 2 |
| ARC fault on monitored unoccupied premises | Priority 1 or 2 |
| Single detector fault | Priority 2 or 3 |
| Printer fault | Priority 3 or 4 |
| Minor text label issue | Priority 4 |
Fire alarm panel showing “disablement”
A disablement means part of the system has been deliberately isolated.
Disablements can be legitimate during maintenance or works, but they should be controlled, recorded and reviewed.
Suggested priority
| Situation | Typical priority |
|---|---|
| Unknown disablement affecting major areas | Priority 1 or 2 |
| Sounders disabled in occupied building | Priority 1 |
| ARC disabled while building is unoccupied | Priority 1 or 2 |
| Detector disabled for works with fire watch in place | Priority depends on risk and duration |
| Planned disablement during engineer attendance | Manage through permit/procedure |
Repeated false alarms
Repeated false alarms should not be dismissed as “just false alarms”.
They can cause:
- Occupants to ignore alarms
- Business disruption
- Unnecessary fire service attendance
- Alarm fatigue
- Pressure to disable parts of the system
- Reduced confidence in the fire alarm system
Suggested priority
| Situation | Typical priority |
|---|---|
| Repeated false alarms from same detector/location | Priority 2 |
| False alarms causing evacuation or fire service attendance | Priority 2 |
| False alarms exceeding BS 5839-1 investigation thresholds | Priority 2 |
| One isolated false alarm with obvious cause | Priority 3, unless risk dictates otherwise |
BS 5839-1:2025 false alarm investigation thresholds
BS 5839-1:2025 Clause 31.2 recommends at least a preliminary investigation where any of the following apply:
| Trigger | Plain English meaning |
|---|---|
| More than 4 false alarms per 100 detectors per annum | The overall false alarm rate is too high. |
| More than 1 false alarm from the same MCP, detector or detector location since the last service visit | The same point keeps causing problems. |
| More than 10 false alarms since the previous service visit | Too many false alarms have occurred in the service period. |
| A persistent cause is identified | There is an ongoing issue that needs addressing. |
| More than 2 unwanted fire alarm signals in the previous 12 months | False alarms have been passed externally too often. |
BS 5839-1:2025 commentary also states that, in systems with more than 40 automatic fire detectors, a rate exceeding 5 false alarms per 100 detectors per annum is never to be regarded as acceptable, particularly where the false alarms result in evacuation or summoning of the fire and rescue service.
For premises with fewer than 41 automatic fire detectors, more than 2 false alarms per annum is regarded as unacceptable.
Practical prioritisation table
| Priority | Suggested response | Typical examples |
|---|---|---|
| Priority 0 | Immediate emergency action / 999 or 112 if fire is suspected. Engineer attendance follows once safe access is available to inspect/test/reinstate the system. | Real fire, smoke, burning smell, sprinkler operation, credible fire report, post-fire system inspection |
| Priority 1 | Emergency callout; BS 5839-1:2025 Clause 44.2.1 emergency arrangement normally expects attendance within 8 hours | Panel dead, system inoperative, sounders failed, major loop failure, major disablement, critical interface failure |
| Priority 2 | Urgent attendance, normally same day or next available engineer depending on risk/SLA | Partial system faults, ARC fault, battery fault, earth fault, repeated false alarms, important device disablement |
| Priority 3 | Planned repair visit | Single device fault, minor local issue, non-critical accessory fault, defect with temporary measures in place |
| Priority 4 | Quote, survey or planned remedial | Additions, upgrades, labelling, zone plan update, system modifications, non-urgent recommendations |
Factors that increase urgency
The same fault may need a faster response depending on the building.
Urgency increases where the building has:
- Sleeping occupants
- Vulnerable occupants
- Care, healthcare or supported living use
- High occupancy
- Public access
- Complex evacuation strategy
- Phased evacuation
- Stay-put or partial evacuation strategy
- High-rise layout
- Large or complex floor plates
- Unoccupied periods
- ARC monitoring dependency
- Fire alarm interfaces to smoke control, lifts, suppression, access control or plant
- Known history of false alarms
- Known water ingress or building works
- Poor management controls
- No suitable temporary measures
Factors that may reduce urgency
A fault may be suitable for planned attendance where:
- Only one device is affected.
- The area is low risk.
- The building remains adequately protected.
- Temporary measures are in place.
- The building is occupied and managed.
- The issue does not affect sounders, manual call points, ARC signalling or critical interfaces.
- The responsible person has assessed the risk.
- The fault is already known, recorded and being managed.
This does not mean the issue can be ignored. It means it may not need an emergency callout.
Temporary measures
Where a fire alarm fault or disablement reduces protection, the responsible person or premises management may need to consider temporary measures.
Examples may include:
- Fire watch
- Additional staff patrols
- Restricting use of affected areas
- Informing occupants
- Manual evacuation arrangements
- Temporary detection
- Isolating hazardous processes
- Stopping hot works
- Updating permits
- Informing insurers or enforcing authorities where appropriate
- Ensuring the fire and rescue service can still be summoned
The suitability of temporary measures depends on the building and risk.
Information to collect before raising a callout
The service desk or coordinator should try to collect:
- Site name and address
- Caller name and contact number
- Fire alarm panel location
- Exact panel message
- Whether the panel shows fire, fault, disablement, pre-alarm or normal
- Whether alarms are sounding
- Whether the building is occupied
- Whether anyone suspects fire
- Whether the fire and rescue service has been called
- Whether the system is monitored by an ARC
- Whether ARC signals have been isolated
- Whether sounders are affected
- Whether manual call points are affected
- Whether detectors are affected
- Whether lifts, smoke control, doors, plant or sprinklers are affected
- Whether there has been water ingress, building work or power loss
- Whether temporary measures are in place
- Photos of the panel display, where safe and appropriate
Example service desk decisions
Example 1 - “Panel dead”
A client reports that the fire alarm panel is blank and there are no lights.
Suggested priority:
Priority 1 - immediate emergency attendance
Reason:
The system may be unable to detect, display or process alarms.
Example 2 - “Single detector fault in office”
A client reports one detector fault in a small office. The panel is otherwise normal and the building is occupied.
Suggested priority:
Priority 3, or Priority 2 if the area is high risk
Reason:
The system may remain broadly operational, but the fault still needs to be recorded and repaired.
Example 3 - “Sounder circuit fault”
A client reports a sounder circuit fault.
Suggested priority:
Priority 1 or Priority 2 depending on the area affected
Reason:
If people cannot hear the alarm in part of the building, evacuation warning may be compromised.
Example 4 - “ARC fault”
A client reports ARC signalling fault on a warehouse that is unoccupied overnight.
Suggested priority:
Priority 1 or Priority 2
Reason:
If the building relies on remote alarm transmission outside working hours, property protection and fire service notification arrangements may be affected.
Example 5 - “Repeated false alarms from same detector”
A client reports repeated false alarms from the same detector.
Suggested priority:
Priority 2
Reason:
Repeated false alarms can cause disruption, complacency and unnecessary fire service attendance. BS 5839-1:2025 expects false alarms to be recorded and investigated where thresholds are met.
Example 6 - “Zone plan missing”
A service visit notes that the zone plan is missing.
Suggested priority:
Priority 3 or Priority 4 depending on the building
Reason:
A missing or inaccurate zone plan can delay alarm investigation and firefighter response. It may not require an emergency engineer at 2am, but it should be corrected.
Suggested wording for job notes
Emergency
Fire alarm system fault reported which may affect life safety, evacuation warning or critical fire safety operation. Treat as emergency callout. BS 5839-1:2025 Clause 44.2.1 recommends emergency call-out arrangements allowing technician attendance normally within 8 hours of a call from the user.
Urgent
Fire alarm fault reported affecting part of the system. System not confirmed fully inoperative, but protection/reliability may be reduced. Arrange urgent attendance to investigate and ensure fault is recorded in the logbook in line with BS 5839-1:2025 Clause 44.2.3.
Planned
Fire alarm defect reported. System appears broadly operational, but defect should be recorded and repair arranged as soon as possible in line with BS 5839-1:2025 Clause 44.2.3.
Quote
Fire alarm recommendation/change request appears to be remedial, improvement or modification work rather than an emergency fault. Arrange quotation/survey/design review as appropriate.
Summary
BS 5839-1:2025 does not provide a full fault-by-fault response priority table.
However, it does clearly support the following principles:
- Emergency call-out arrangements should exist where third-party maintenance is used.
- A technician should normally be able to attend within 8 hours of a call from the user under those arrangements.
- Faults and damage should be recorded in the logbook.
- Repairs should be arranged as soon as possible.
- Fault indications should not be concealed if the fault cannot be rectified.
- False alarms should be recorded, reviewed and investigated where necessary.
- Premises management remains responsible for testing, maintenance arrangements, records, occupant instruction and day-to-day management of the system.
The practical priority should always be based on:
- What part of the system is affected
- Whether people can still be warned
- Whether detection is still effective
- Whether manual call points still operate
- Whether ARC signalling is required
- Whether critical interfaces are affected
- The building use and occupancy
- The fire strategy
- Whether temporary measures are in place