Automatic emergency-light test system reporting faults
An addressable / automatic emergency-lighting test system is flagging faults or losing communication with fittings — common in larger commercial buildings.
Safety first
These systems monitor life-safety fittings — a comms fault can hide a real fitting fault. Isolate before working on fittings; licensed work, follow the system documentation.
Isolate, lock out / tag out, and prove dead before working unless a live test is specifically required, authorised, and carried out under proper supervision. Always follow local regulations, your site procedures, and the equipment manufacturer's documentation.
Apprentice mode
Full walk-through — the why, what readings mean, mistakes & safety.
Likely causes
Ranked from most to least likely.
- 1
A genuine fitting fault reported
Most likelyThe system has correctly detected a failed fitting/battery/lamp — find and rectify it.
- 2
Addressing / comms loss to a fitting or loop
#2A wiring or addressing fault loses communication with one or more fittings.
- 3
Controller / panel fault
#3The central test controller or its configuration is at fault.
- 4
Central battery system fault (if applicable)
Least likelyOn central-battery systems, the central supply/battery has a fault.
Reports are saved on this device to reflect what you actually find.
Testing sequence
Work through one test at a time. Expected reading and what each result means.
On the tools? Job Mode shows one test at a time with thumb-sized buttons — your place and readings carry straight over.
Enter Job ModeRead the exact fault(s) and which fitting(s)/loop the system reports.
A specific fault and location.
A specific fitting fault — go and rectify that fitting.
If comms/loop faults, check the wiring/addressing.
View all expected readings at once
Fault-finding flowchart
The same logic as a decision tree.
- 1start
Emergency test system fault
→ step 2 - 2decision
Does it report a specific fitting fault?
Yes→ step 3No→ step 4 - 3result
Rectify that specific fitting and re-test.
- 4decision
Is the loop wiring/addressing sound?
Yes→ step 5No→ step 6 - 5result
Suspect the controller/central system — per documentation.
- 6result
Loop/addressing fault — rectify.
Common mistakes apprentices make
- Dismissing a system fault as 'just the panel' when a fitting really has failed.
- Not reading the specific reported fitting/loop.
- Overlooking addressing after a fitting swap.
- Working on fittings without isolating.
When to stop & escalate
Addressable/central-battery systems often need the manufacturer's documentation and a competent commissioning approach. Reported fitting faults must still be physically rectified and recorded.
If you're past your competence, authorisation, or the safe limits of the job — stop and hand it on. There's no fault worth getting hurt over.
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Related faults
Emergency light fails its discharge test
An emergency fitting works on mains but won't stay lit for the required duration when tested (mains removed) — usually a failed/aged battery, but can be charging or lamp issues.
Exit sign not illuminated
An illuminated exit sign is dark — it may have lost supply, failed its lamp/LED, or have a faulty driver. A life-safety fitting that must be kept working.
Data cabling run fails certification / wiremap fault
A structured cabling run fails a tester (wiremap fault, open, short, split pair, or excessive length) — so it won't reliably carry the network even if a link sometimes appears.