Sorry chaps/chapesses, another wee toilet thread

Discussion in 'Motorhome Chat' started by G-RMPS, Feb 22, 2019.

  1. G-RMPS

    G-RMPS Funster

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    Hi, my Thetford 260 fan has stopped working. I know some folk disable it anyway but I’ve just spent £20 on a new filter! I’m struggling to determine whether the fan has gone pop or the PCB has blown.

    I’d like to put 12v directly on the fan to see if it works or not. I’m reluctant to try to dig it out yet as this will destroy the foam seal between it and the cassette and I’m not sure the fan can be pulled directly out of the recess if I do rip off the seal.

    There’s a four way spade connector nearby which looks as if it goes towards the fan (or maybe the PCB which is perhaps more likely). On the power side there’s 12 volts on two pins and nothing on the other two. The fan will only have two wires. Is there any way to deduce whether the fan is good from this? I do have a 12v source if I can get directly to the fan.

    Thanks.
     
    Last edited: Feb 22, 2019
  2. Speve

    Speve Funster

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    You need to check the cable with a multi meter to assertain which cables are live etc.
     
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  3. Mikescuba

    Mikescuba Funster

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    As above. Test with a multi meter. you can buy them on ebay for around £15. Useful bit of kit to have with a MH. Test the connection to the fan and see if you have power coming through.
     
  4. G-RMPS

    G-RMPS Funster

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    I have a mulitmeter and used it to test the four pins on the plug. I was asking whether anyone knew which of these (if any) connect directly to the fan.
     
  5. Diabalo

    Diabalo Funster

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    My fan packed up, its just a small 40mm or 30mm PC fan that you can get of e-bay for about £5 you want the one with 2 wires, some have an extra 3rd sensing wire when used in a computer. The Thetford replacement is £50. When I took the original out it was exactly the same make/model as the one of e-bay
     
  6. G-RMPS

    G-RMPS Funster

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    Thanks, how did you buy or make the foam seal?
     
  7. Diabalo

    Diabalo Funster

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    I'm struggling to remember the seal, is it square with a whole in it? I didn't replace or make a new one so I must have salvage the original and used that, if it's what I'm thinking of then it was closed cell foam like neoprene, so easily sourced if you need to make a replacement. I remember the wiring was tight as it was trapped under the toilet outer housing.
    Sorry I can't be any more help.
     
  8. G-RMPS

    G-RMPS Funster

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    Ok, thanks. I’ll plan to make one from neoprene assuming I can source a fan (if, indeed, it is the fan that’s duff!).
     
  9. G-RMPS

    G-RMPS Funster

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    Mouser.com sell the identical fan for about £10, but with postage comes to £24! You can get similar but not identical fans from China for less than a fiver but delivery could be weeks. I got a sample size of adhesive-backed neoprene for £1.50.
     
  10. ChrisL

    ChrisL Funster

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    I'm not familiar with this particular fan, however, low voltage fans sometimes get a flat spot on a bearing and stop turning, if a little push gets it working then it's time for a new fan.
     

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