Posting a message to the forum will remove the above advertisement

Discuss Problem with a timer fan on light circuit in the Lighting Forum area at ElectrciansForums.co.uk.

Please make sure you checkout our forum sponsors, many do discounts for members and, they keep the forum free to use.
  1. Tilecutter
    Offline

    Tilecutter Active EF Member

    I fitted a 6" fan yesterday to an existing circuit that was already in. The existing fan had been taken out and the hole tiled over by the previous owner of the property and an illuminated mirror hung in its place that was powered by the switched live. The pemanant live was taped up. I core drilled the hole back out and fitted the timer fan. All went wrong when the fan didnt stop. I returned it thinking it was dodgy, and refitted as new one. Same problem. On investigation I have found a small voltage in the upstairs lighting circuit in all of the rooms eyeball fittings when the lights are switched off. I thought the fault must be in the nuetral as every room is affected. Im going to return tomorrow and test the circuit with my meters. Any one got any pointers as Im flumaxed as to where it might be coming from? The property is a Dorma Bungalow with a flat roof so no access to the JB's.
     
  2. Leesparkykent
    Offline

    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    What voltage did you have on the Switched live when it was supposed to be off?
     
    • Agree Agree x 1
  3. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    Dead tests to confirm you have the PL, SL and N identified correctly would be a good start
     
    • Agree Agree x 1
  4. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Think some rudimentary tests were required as opposed to thinking the fan was dodgy.
     
    • Agree Agree x 1
  5. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    was a recent thread on similar problem. turned out that the fan, once powered up, ran for 30 minutes before resetting. and reverting to normal operation. could be the same thing.
     
    • Agree Agree x 1
  6. Rpa07
    Offline

    Rpa07 2000 posts - only 46379 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    30 mins is a long time when having fitted the fan. Can you remember if it said it in the manufacturers instructions? sometimes they have some useful information in them.
     
    • Like Like x 1
  7. Tilecutter
    Offline

    Tilecutter Active EF Member

    Im getting about 9 volts
     
  8. buzzlightyear
    Offline

    buzzlightyear Electrician's Arms

    Location:
    star command
    . upload_2017-8-11_19-25-21.png there you go help you self to this diagram. and don't for get a timed isolator switch
    with out blowing you self to bits .
     
    • Like Like x 1
  9. Tilecutter
    Offline

    Tilecutter Active EF Member

    Theres no mention of anything in the instructions. Powered it down at the fuse before making any adjustments also
     
  10. buzzlightyear
    Offline

    buzzlightyear Electrician's Arms

    Location:
    star command
    is it on a battery!
     
  11. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    on the thread i mentioned where OP has same thing, fan would not stop, the OP came back and said he'd gone back, powered it up again and it ran for 30 mins then stopped, then worked as normal.
     
    • Like Like x 1
  12. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Some fans do go for a long run after initial power up. Most recent a Soler & Palau in line unit (picked cause it doesn't ask for an efenfuse). I recalled "the watched pot never boils" and just ignored it. Came back about an hour later and it was good as gold.
     
    • Like Like x 2
  13. buzzlightyear
    Offline

    buzzlightyear Electrician's Arms

    Location:
    star command
    how to fit it ,it was made for competent electricians to fit
    and not you. buy looking at you thread .
     
    • Dislike Dislike x 1
  14. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    most fans are set at 20 mins at the factories ..............
     
  15. Tilecutter
    Offline

    Tilecutter Active EF Member

    Yes it was set at 15 mins. I wound it up to 30 before powering up. I was talking to the customer for a good 40 mins and it wasnt stopping. It was 10 pm when I decided to eliminate the fan problem first as the job is out in the sticks and the fan was sourced locally to me. I have identified the wires correctly.
     
    • Like Like x 1
  16. Tilecutter
    Offline

    Tilecutter Active EF Member

    Ive had my 2391 for 8 yrs. not come across this problem before.
     
    • Like Like x 1
  17. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    Why do you need a 6" fan?
     
    • Like Like x 1
  18. Tilecutter
    Offline

    Tilecutter Active EF Member

    I'll contact Xpelair and find out but no mention in the instructions about any run in time.
     
    • Like Like x 1
  19. Tilecutter
    Offline

    Tilecutter Active EF Member

    Its a big room and the existing hole was 6"
     
  20. buzzlightyear
    Offline

    buzzlightyear Electrician's Arms

    Location:
    star command
    which model!
     
  21. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    Maybe the PL and SL are reversed..............
     
  22. Tilecutter
    Offline

    Tilecutter Active EF Member

    Ive disconnected the SL and with the light switch off if I touch it to the SL terminal and then remove it the fan runs for set time as its supposed to. It is something to do with the voltage constantly in the SL thats still sending a signal?
     
  23. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    Are you 100% sure the SL isn't also a PL?
     
  24. Tilecutter
    Offline

    Tilecutter Active EF Member

    Yes 247 v switch on and 9 volts switch off, Fluke T120
     
  25. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    I'm not following, sorry. This seems to say your manual SL makes the fan work normally, but put SL on a light switch (that's connected to the same circuit) and it's playing up? If so, isn't it the switch? Hasn't got leakage current from a neon perhaps? Or a dimmer ?
     
  26. Tilecutter
    Offline

    Tilecutter Active EF Member

    If I diconnect the SL once the fan has activated it runs and stops as normal once the time has elapsed. Which leads me to thinking because theres a constant voltage in the SL ( although only low) it dosnt think youve switched off.
     
  27. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    You could put a small load on the SL and see if it fixes it? Pilot lamp perhaps?
     
  28. Lee42
    Offline

    Lee42 Lee

    Location:
    England
    No led lamps on the circuit?
     
  29. Tilecutter
    Offline

    Tilecutter Active EF Member

    Theres a couple of dimmers on the downstairs circuit. I have knocked all fuses off to all circuits bar the upstairs which hasnt got any
     
  30. Tilecutter
    Offline

    Tilecutter Active EF Member

    no visible neons neither
     
  31. buzzlightyear
    Offline

    buzzlightyear Electrician's Arms

    Location:
    star command
    may be they had problems with the last fan ,that's why they tiled over the hole in the beginning.
     
    • Funny Funny x 2
  32. Tilecutter
    Offline

    Tilecutter Active EF Member

    And they might not have had access to the countrys top electricians to sort it out :)
     
    • Like Like x 1
    • Funny Funny x 1
  33. spinlondon
    Offline

    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    Am thinking, there's a problem with the heated mirror.
    Try disconnecting it, see what happens.
     
  34. Tilecutter
    Offline

    Tilecutter Active EF Member

    I tested with a Fluke T120 Its not supposed to give a LCD readout below 12 volts but if I switched the light switch on it read 247v and when off it went down the scale and rested at 9 v. I usually just get red lights illuminated and a buzzer at 12 volts on the scale on the meter. Which tells me its less than 12
     
  35. Tilecutter
    Offline

    Tilecutter Active EF Member

  36. Tilecutter
    Offline

    Tilecutter Active EF Member

    if I pass the SL through my meter to the terminal on the fan this would have the same effect, would it not? Yes worth a try. It would tell me if a neon would work.
     
  37. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Hi - thought was to try a small load from SL to N at the fan. Purpose is to clamp off SL to zero volts when light switch is open. It will only have effect if there is leakage through the switch or induced voltage from other cables. Good hunting !
     
  38. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    FWIW I would call the manufacturer of the fan ................
     
  39. Midwest
    Offline

    Midwest Electrician's Arms

    Location:
    Oxfordshire
    My Fluke 110 gives me or sorts 'low' voltage readings, which I don't believe in :). Have you tried measuring this 9 volts with an analogue meter, before you get led up the garden path?
     
    • Agree Agree x 1
  40. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    You've ruled out the fan as being the problem as far as I can see, so now you need to track down where the this 9V is coming from.

    What have you measured the 9V with reference to, earth or neutral?
    if you have a suitable multimeter then try measuring it with that, I suspect it will give a higher voltage reading.

    I think the simplest explanation for a voltage on the S/L when it shouldn't be is that the switch is not operating correctly, so I'd be inclined to test that first.
     
  41. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    How could the mirror be causing this?
     
  42. Midwest
    Offline

    Midwest Electrician's Arms

    Location:
    Oxfordshire
    If the voltage actually exists, as well as checking the switch, the remainder of the circuit (i.e. in other rooms) needs to be verified that its wired correctly. I had to fix a fault, where live had been connected into neutral and neutral vice versa.
     
  43. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    methinks all threads regarding timer fans should themselves be on a timer, and self-destruct after 2 days.
     
    • Funny Funny x 1
  44. Midwest
    Offline

    Midwest Electrician's Arms

    Location:
    Oxfordshire
    Could be on a humidistat, only come on if things steam up :)
     
    • Creative Creative x 1
  45. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    now you're complicating the issue. my brain is conditioned for saturday afternoon. beer and kip.
     
    • Agree Agree x 1
    • Optimistic Optimistic x 1
Loading...
Similar Threads - Problem timer light Forum Date
GreenBrook KingShield T205-C Fused Timer Spur Switch 1/5/7 Day problems Electrical Forum Jul 13, 2017
Smart meters- anyone had problems? Electrical Forum Oct 9, 2017

Share This Page

  • Electricians Directory Post a Domestic Job Post a Commercial Job