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Kitchen LED lights start to flicker when i isolate the extractor fan

Discussion in 'Electrics UK' started by Guiem Bernat, 22 May 2020.

  1. Guiem Bernat

    Guiem Bernat

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    I am replacing the extractor fan in the kitchen. It has a fused isolator switch. When i switched it off to be able to get to the extractor fan safely, the 8 LED ceiling lights start to flicker.

    Switch the isolator back on again and flicker stops!

    There is no dimmer on the LED lights, just an on/off switch.

    Any ideas on what may be causing this? Is it normal?

    Could it be related to the fact that the extractor fan may be connected to the lighting circuit and when the isolator is on, even if the extractor fan is off it still draws some current?

    Could it be something more sinister?


    Help greatly appreciated!

    Thank you

    G.
     
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  3. oldbutnotdead

    oldbutnotdead

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    No its not normal. It could be something very simple (like a loose connection inside the isolator, if the lights are looped in after the isolator then that would be feasable), or it could be something very odd (isolator wrongly wired).
    Isolate at CU, unscrew the isolator switchplate, confirm dead with your multimeter and show us the pics
     
  4. JohnD

    JohnD

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    Do you mean they're "on," and they start to flicker "off?"

    Or do you mean they're "off" and start to flicker "on?"

    Different causes, and different remedies.
     
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  5. Guiem Bernat

    Guiem Bernat

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    Thanks John and OldButNotDead (i like your username)

    The isolator just has a single cable and seems it does its job. No reading with the meter when off. I will post picture next

    John, LED lights flicker when they are on.

    I removed the extractor fan last night
    Nothing is connected to the supply. So now LED lights flicker when ON independent of the isolator.

    Seems that when there is a load flicker stops....

    Thanks
     
  6. Guiem Bernat

    Guiem Bernat

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    Picture of extractor fan.
     

    Attached Files:

  7. Guiem Bernat

    Guiem Bernat

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    Picture of isolator
     

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  8. JohnD

    JohnD

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    What voltage and size are the LEDs? Can you put an incandescent lamp into one of them?

    Usually I'd be thinking a loose connection in a ceiling rose or switch, but the fan effect is odd.
     
  9. Guiem Bernat

    Guiem Bernat

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    I attach picture of the lights... and drivers...

    7w lights
    Voltage AC 85 - 265V 50-60 Hz
    300mA

    Attached to LED driver....i took a picture and it does not look good. Plastic has melted! The other 7 are ok.

    Input. LS 85-265 V 50/60 Hz
    5-7 x1 W
    Output. DC 12-24 V 300ma
     
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  11. Guiem Bernat

    Guiem Bernat

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    Pictures attached
     

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  12. bernardgreen

    bernardgreen

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    Why do manufacturers print such misleading rubbish,

    300mA = 0.3 Amp

    0.3 A x 85 V = 25.5 watt, ( bit more than 7 watt )
    0.3 A x 240 V = 72.0 watts

    The 300 mA refers to the current that the lamp drives through the LED elements and NOT the current taken from the mains supply.
     
  13. ericmark

    ericmark

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    It does not make sense, lamp is 85 to 265 volt so one would think connected direct to mains, and the 300 mA driver would normally power 4 to 8 LED,s (not lamps the LED chip) in series they don't seem to go together.
     
  14. bernardgreen

    bernardgreen

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    Eric

    I wonder if the white driver module enclosed inside the lamp housing or attached to the outside as part of the lamp.
     
  15. sparkymarka

    sparkymarka

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    Love the melted driver unit ....
     
  16. Guiem Bernat

    Guiem Bernat

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    Thank you for pointing out the obvious.

    Feel like an idiot not realising that led lights should have been connected to mains.

    Previous owners set ot up and as soon as we moved in we had lamps flickering. Overheated transformers (no wonder why!) And one blew up!

    G
     
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