Thetford toilet flush

Discussion in 'Tech/Mech General' started by hoot007, Mar 3, 2015.

  1. hoot007

    hoot007 Funster

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    Need some ideas our toilet has ceased to flush!
    I have checked there is 12v live cleaned the fuse taken the switch apart cleaned the contacts put it back together correctly, now I am stuck.
    Dosen't bother me I go round the back of the van anyway but Joyce likes to here the swish of water
    It's a standard thetford toilet and grey cassette
    Thanks in anticipation John
     
  2. Granjan

    Granjan Funster

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  3. Reallyretired

    Reallyretired Funster

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    As you've checked everything else it looks like the electrically operated valve is faulty. Afraid I don't know how to access it though.
     
  4. dave newell lvs

    dave newell lvs Trader-Vehicle Services

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    Assuming it has its own water tank and doesn't draw water from the main on board tank Its a fair bet the pump has died, we seem to be having a run on them failing at the moment. Submersible pumps don't like being dried out and often go rusty inside and seize up.

    D.
     
  5. jollyrodger

    jollyrodger Funster Life Member

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  6. hoot007

    hoot007 Funster

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    Hi thanks for the suggestions so far.
    There is no thetford no. But it is fed from a pipe connected to the cold system I.e. no tank and as mentioned above it will have an electrical valve somewhere I will search for it and report back
     
  7. tonyidle

    tonyidle Funster

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  8. hoot007

    hoot007 Funster

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    Hi may have found the problem the electro magnet valve which is rated at 10 watt is just under the seat you have to remove the pan to find it, removed it connected it direct to a battery it functions fine checked the wiring seems fine except there is a 1n 5408 diode connected to the spade CONNECTORS I guess this is faulty when the button is presset the connectors show 12v with a tester I connected a light across the wires and it is very dull I.e not enough power to the electro Vale I am not an electronic genius would anyone no if my guess is correct I don't know what a diode does.
    Thanks john
     
  9. tonyidle

    tonyidle Funster

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    The diode suppresses a spark that would be caused as you release the flush switch. Sparking would wear the switch out and happens because the switch is operating an electromagnet in the valve. Your next test is to re-connect the wires to the valve, connect your meter across the valve, then check the reading with the flush button pressed. I suspect from your test with a bulb that you won't see the full 12v. If so you need to trace the supply to the toilet back to its source - there'll be a fuse and an earth connection somewhere nearby. One or the other will be dirty/corroded/slack.
     
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  10. andy63

    andy63 Funster

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    hi john , joyce sorry cant be of more help , but above posts seem to cover the things you need to look at.
    can say that if the diode went faulty you would either have a short which you don't seem to have, or the valve would still work but your switch would eventually fail as pointed out above... ie don't think your problem is a dodgy diode (its just a one way electric valve....allows current flow in one direction only )
    hope your trip is going well apart from your faulty loo. :)
    ta andy
     
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  11. f6c

    f6c Funster

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    Hoot 007 you know hell of a lot more than me:whistle:
     
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  12. DavidG58

    DavidG58 Funster

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    Hello J + J, not got the answer, but my flush froze in Scotland in January, a cup of water from the sink does exactly the same job :)

    David


    edit = John you will just need to make an appropriate buzzing noise at the same time :D
     
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  13. hoot007

    hoot007 Funster

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    I will sound stupid stood out back of the van buzzing every hour or so
    John
     
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