Never assume a panel indication is only a nuisance fault
Check for a genuine fire condition first, follow the premises fire procedure, record all indications and use only authorised controls. Any impairment should be managed by the Responsible Person and corrected by a competent fire-alarm engineer.
MOST LIKELY CAUSES
Start with the panel information
Symptom variations Match the exact display, LED and event behaviour. ⌄
- Mains LED off
- General fault and power fault LEDs
- Panel remains alive on batteries
- Fault follows power work
- Several panels report supply loss
Safe first checks Checks for authorised site staff before engineering work. ⌄
- Check for a red fire indication before treating anything as a fault.
- Read and record the exact display text and LEDs.
- Identify the affected zone, address, circuit, node or power source.
- Check the site log book and recent work.
- Do not disable or reset repeatedly to hide the indication.
Step 1 — Confirm the panel is operating on standby Follow the site fire procedure and use authorised controls only. ⌄
Record the display and check whether other faults are present.
Step 2 — Check the labelled fire-alarm supply externally Follow the site fire procedure and use authorised controls only. ⌄
Confirm the isolator has not been switched off or damaged.
Step 3 — Restore supply through an authorised person Follow the site fire procedure and use authorised controls only. ⌄
Electrical work and internal checks require competence and safe isolation.
What the indication usually means How this condition develops. ⌄
A mains fault means the control equipment has lost or cannot confirm its normal AC supply and is relying on standby batteries where available.
Engineer diagnostic sequence Competent-person checks after site information has been captured. ⌄
- Verify the dedicated supply at the panel terminals.
- Inspect protective devices and internal mains fuse.
- Check charger input and mains-monitoring circuit.
- Confirm battery condition after prolonged discharge.
- Test fault restoration and record the duration of the outage.
Information and equipment needed Useful items for accurate fault finding. ⌄
- Exact panel make and model
- Event log and site log book
- Zone plan and as-fitted drawings
- Cause-and-effect information
- Manufacturer documentation and approved test equipment
Parts that may be involved Components commonly associated with this fault. ⌄
- Dedicated isolator
- Protective fuse or device
- Internal mains fuse
- Power-supply unit
- Standby batteries
When immediate action is required Conditions that should trigger escalation or an impairment plan. ⌄
- The panel is in fire and the cause is not confirmed.
- The control equipment is dead or repeatedly restarting.
- Detection, alarm devices or signalling are disabled or unavailable.
- The fault affects multiple zones, loops, panels or network nodes.
- The panel cannot remain on standby power.
- The site cannot maintain its required fire strategy.
Frequently asked questions Common control-panel questions. ⌄
Can the internal buzzer be silenced?
Authorised users can normally acknowledge or silence the internal panel buzzer after reading and recording the condition. The fault remains active until its cause is repaired.
Should the panel be reset?
Only after the initiating condition has been investigated and cleared. Repeated resetting can remove useful information and delay repair.
Who should repair the fault?
A competent fire-alarm engineer familiar with the equipment, system design and site fire strategy.