Emergency light stays on / won't go back to normal
An emergency fitting stays in emergency (battery) mode or its charge/fault LED stays wrong even with normal supply present — pointing at the supply sensing, charging, or the fitting.
Safety first
Isolate before working. A fitting stuck in emergency drains its battery, leaving it unprotected for a real event. Licensed work.
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.
Full detail — causes, the why, and common mistakes.
Likely causes
Ranked from most to least likely.
- 1
Normal supply to the fitting missing / sensed wrong
Most likelyThe fitting senses no mains (lost active to its sensing) so it stays in emergency.
- 2
Stuck in test mode
#2A test switch/controller has left it in test/emergency.
- 3
Charging/control board fault
#3The control gear isn't transferring back to normal/charge.
- 4
Wiring fault (switched vs permanent supply)
Least likelyThe fitting's permanent (unswitched) supply isn't connected/working.
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.
Confirm the fitting's permanent (unswitched) normal supply is present at its sensing terminals.
Permanent normal supply present.
Supply present but stuck on — check test mode and the control board.
Missing/switched supply — restore the correct permanent supply.
View all expected readings at once
Fault-finding flowchart
The same logic as a decision tree.
- 1start
Emergency light stays on
→ step 2 - 2decision
Is the permanent normal supply present at the fitting?
Yes→ step 3No→ step 4 - 3decision
Is it free of test mode and transferring back to normal?
Yes→ step 5No→ step 6 - 4result
Restore the correct permanent (unswitched) supply.
- 5result
Control board not transferring — rectify the fitting.
- 6result
Clear the test mode.
Common mistakes apprentices make
- Not realising the fitting needs a permanent (unswitched) supply.
- Leaving it in test mode.
- Letting the battery drain while stuck on.
- Assuming the battery when it's a supply-sensing issue.
When to stop & escalate
Emergency lighting wiring (permanent supply) and control-gear faults are licensed work. A fitting that won't return to normal should be rectified promptly so it's ready for a real event.
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.
Related faults
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.
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.
LED lights glowing faintly when switched off
LED lamps glow dimly or pulse even after the switch is off — unsettling but usually a small leakage/induced-voltage effect rather than a dangerous fault.
Learn the theory
How the gear and circuits behind this fault actually work.