Security Light Won't Turn Off

Your security light is stuck on permanently and will not turn off, even during the day.

£60 – £150Low Risk

What is this?

A security light that stays on continuously is usually caused by a stuck PIR sensor, incorrect settings, or a wiring fault that bypasses the sensor. While not dangerous, it wastes energy, can annoy neighbours, and means the light is not functioning as a security device because it no longer responds to movement.

Common causes

PIR sensor stuck in the on position due to a fault
Manual override switch left in the always-on position
Light was power-cycled quickly (off-on-off-on) which activates test or override mode on many PIR lights
Wiring fault bypassing the PIR sensor
Sensor detecting constant heat sources like boiler flues or air conditioning units

Is it dangerous?

This is not dangerous, but it is wasteful and means your security light is not providing motion-activated protection. A light that is always on is actually less effective as a security deterrent because movement no longer triggers a noticeable change.

Can I fix it myself?

Try turning the light off at the switch for at least 30 seconds, then turn it back on. This resets most PIR sensors. Check if your light has a manual override — many PIR lights activate an always-on mode when the switch is flicked off and on within a few seconds. If there are adjustable dials on the unit, check the timer setting is not set to maximum. Some lights have a daylight sensor that may be faulty.

When to call an electrician

Call an electrician if resetting the light does not fix the problem, if the PIR sensor appears to have failed in the on position, or if you suspect a wiring issue is bypassing the sensor. Also call if the light is overheating from being on continuously.

What will an electrician do?

Inspect the PIR light and test the sensor function

Check the wiring to ensure the sensor is correctly connected in the circuit

Reset or replace the PIR sensor if it has failed

Replace the entire fitting if the sensor cannot be independently replaced

Reposition the sensor away from heat sources that may cause false triggers

Typical cost

£60 – £150

Usually resolved with a sensor reset or fitting replacement. A new LED PIR security light supplied and fitted typically costs £80–£150.

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Sources & References

Frequently Asked Questions

Why is my security light stuck on all the time?

The most common cause is the PIR sensor being stuck in override mode. Try switching the light off for 30 seconds and back on. If the sensor has failed, the unit will need replacing.

Can a security light staying on be a fire risk?

Modern LED security lights produce very little heat and are unlikely to be a fire risk even when on continuously. Older halogen floodlights produce significant heat and should not be left on for extended periods near flammable materials.

My security light comes on during the day — is that normal?

Most PIR security lights have a built-in daylight sensor that should prevent them activating during the day. If yours comes on in daylight, the daylight sensor may be faulty, covered, or the light may be set to manual override mode.

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