2 Way switch wiring problem

Discussion in 'Electrics UK' started by richard266, 21 Nov 2015.

  1. richard266

    richard266

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    Hi everyone.

    I am changing a switch to a bathroom where one switch controls extractor (left switch) and right switch controls a light. I have wired up and am getting nothing from left switch and if right switch is used both lights and extractor fan are on.... lights2015.png

    I have labeled wires using A, B, C etc and connections numbered in green. Could anyone let me know what wires go where to get the switch working right?

    Many thanks.

    Richard
     
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  3. sparkwright

    sparkwright

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    What happens when right switch is off? (you may have to turn the left one on first to see)
     
  4. EFLImpudence

    EFLImpudence

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    How did it work before?
     
  5. richard266

    richard266

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    If the switches are in the off position nothing happens. So both switches off - no lights, no extractor, Left switch on - nothing. Right switch on both lights and extractor are on.
     
  6. richard266

    richard266

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    The layout of the back of the old switch was significantly different - I have a similar problem before which was solved on here so I didn't think I would have had the same problem again.
     
  7. sparkwright

    sparkwright

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    Do two of the wires have their ends 'doubled over'?
     
  8. richard266

    richard266

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    Not as as far as I can see - have also noticed that light to landing is no longer working - I'm sure once the correct wiring is used this will probably work OK
     
  9. sparkwright

    sparkwright

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    A more detailed description on how things are currently working would tell us where each wire needs to go. At the moment it doesn't quite make enough sense.

    However, if you can trace each wire, the light wire goes in one of the L1s. The fan wire goes in the remaining L1. Each remaining wire goes in each COM, with the link between the COMs.
     
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  11. richard266

    richard266

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  12. PrenticeBoyofDerry

    PrenticeBoyofDerry

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    Do you have a two pole voltage indicator, the thing we and you need to know, is which cable is the permanent live one.
     
    Last edited: 21 Nov 2015
  13. bernardgreen

    bernardgreen

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    Since light and fan operate together it is safe to assume that A and C are to the lamp and fan. ( either way round ) Also there for saf to assume that B is the incoming supply.

    D is probably a feed to some other lamp or the permanent Live to the fan if it has a timer.

    So I would suggest that the correct wiring is D and B are linked by the bridge wire and A and C are not linked.
     
  14. PrenticeBoyofDerry

    PrenticeBoyofDerry

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  15. sparkwright

    sparkwright

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    I mean currently, as it is now. I would say your description how it appears to be working now is lacking something as I can't quite determine how to swap those wires around without you having to get a test meter, which PBoD has now suggested.
     
  16. richard266

    richard266

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    I'm afraid not and feel guilty for posting again - apologies...
     
  17. richard266

    richard266

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    So are you thinking...

    D - 1
    B - 2
    A - 3
    C - 4

    with the lights on the landing not working your assumption of D feeding off to that seems logical.
     
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