Fix a light that won't turn on
Save £40–80 in 15 mins — no electrician needed
A light that stops working is almost always a dead bulb, a tripped breaker, or a loose connection. Work through the causes in order and you will find it in minutes.
Last updated: March 2026
Only basic tools needed — most homes already have them.
Before you start
This guide covers a light that stopped working — either suddenly or gradually. Work through the steps in order from simplest to most complex. In most cases it is resolved at step one or two.
If a light flickers rather than not working at all, the cause is almost always a loose bulb or a failing LED driver — try tightening or replacing the bulb first.
Always turn off the circuit at the consumer unit before opening any ceiling rose or light fitting. Switching the light off at the wall switch is not sufficient — the switch only breaks one wire, and live conductors remain inside the fitting.
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Tools & materials
- ✓Torch or head torch— essential if the room has no other light source
- ✓Step ladder— to reach ceiling fittings safely
- ✓Flat-head screwdriver— to open ceiling roses and lift bulb contacts
- !Replacement LED bulb— match the cap type (BC bayonet or ES screw) and wattage to the fitting
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Start with the simplest cause: the bulb
Before anything else, turn the light off at the switch, wait 30 seconds for any filament to cool, and replace the bulb with one you know is working (borrow from another lamp). Turn the switch back on. Why: a dead bulb is the cause of a non-working light in the majority of cases, and it takes 30 seconds to check. No further diagnosis is needed if a new bulb fixes it. LED bulbs fail gradually (they dim or flicker before dying), while older incandescent and halogen bulbs fail suddenly. If a bulb has blown, also check that the wattage of the replacement is within the fitting's maximum rating — usually marked inside the shade or on the fitting.
Most people get this done in under 5 minutes.
Where beginners go wrong
Assuming it is a wiring fault without checking the bulb first. A dead bulb takes 30 seconds to rule out. Check it before doing anything else.
Opening ceiling fittings with the switch off but the circuit still live. The switch only breaks one conductor. Turn the circuit off at the consumer unit before touching any wiring.
Using a bulb with a higher wattage than the fitting allows. Most LED fittings have a maximum wattage marked inside. Exceeding it overheats the fitting and can damage it.
Ignoring a repeatedly tripping circuit breaker. A breaker that trips every time the light is turned on has a fault on the circuit — usually a failed fitting or damaged cable — that needs an electrician to trace.
Stop and call an electrician if...
The circuit breaker trips every time the light is switched on — there is a fault on the circuit that needs tracing
You see burn marks, smell burning, or find discoloured wires inside the fitting — do not use the circuit until it has been inspected
The light flickers on multiple fittings across the house — this can indicate a loose connection at the main earth or neutral
You are not confident working inside a ceiling rose — there is no shame in calling an electrician for this
Cost breakdown
Recommended starter kit
Five tools that cover most home repairs.
- →Adjustable spannerAmazon·Screwfix
- →Screwdriver setAmazon·Screwfix
- →PTFE tapeAmazon·Screwfix
- →Spirit levelAmazon·Screwfix
- →Tape measureAmazon·Screwfix
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What you just learned
You can diagnose a non-working light systematically — bulb first, circuit second, switch third, fitting fourth. This diagnostic approach applies to any electrical problem in your home: identify the most likely and simplest cause, rule it out, then move to the next.
This unlocks:
⚠️ Watch out if you rent
You can change bulbs and reset circuit breakers in a rented property without permission. Any work inside ceiling roses or light fittings that involves touching wiring should be reported to the landlord first — they are responsible for the electrical installation.