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Swap the bulb with another one and see what happens. Different lighting technologies need to be dimmed in different ways (and some can't be dimmed). Someone may have put in a replacement bulb with the wrong specs.
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I guess the dimmer module is still providing a teeny bit of current and that light is the first in the series.
It’s a simple, if not strictly allowed, DIY job to change it.
If you’re lucky one of your other dimmers will have the same module, you could swap them over to test the theory before you spend £10 or whatever.
Obvs if in doubt pay a pro.
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It's because they require so little energy to power them that there's enough parasitic power (energy picked up from adjacent cables) in the circuit to give a very small amount of light.
Usually nothing to do with the dimmer as in the off position it's disconnecting power completely.
Sometimes you see 'phantom' power on circuits when you're testing to see if they are dead. If you use a normal tester it gives you a warning. A 'real' meter will apply enough load to the circuit that the phantom power disappears.
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NickCJ
Hefty
Airhead
@Simpson
Just realised one part of our kitchen lighting has one light that stays slightly on when ‘off’ on the dimmer switch. Others are off as but this goes off when turned off then comes back slightly on?!? What would be the reason if anyone has an idea?
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