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Thread: Thetford Toilet Problem

  1. #1

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    Thetford Toilet Problem



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    I have a Thetford C200 toilet in my Autotrail Miami 740S
    Just recently the flush button stopped working.
    I assumed it would be the Electric Valve inside the toilet bowl, and dismantled the assembly in order to access it.
    Pulled the wires off, and the water pipe and thought I would check the voltage.
    Using a multimeter on the wires, I was surprised to get a reading of 4.6v
    Checked at the switch, and again 4.6v
    Checked at the wire entering the fuse housing, and again 4.6v

    The Electric Valve clearly has 12v written on the label, so I checked it using a leisure battery. I could clearly hear the valve clicking, which I am assuming means its working.

    Can anyone throw a light on where to look next please.

  2. #2

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    Take the wire off after the switch and see if the voltage comes up to 12v, this will determine load is pulling the voltage down, if it stays at 4.5v then it is a bad connection. Is it the one pump that feeds the whole water system or is the toilet on it's own pump.
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  3. #3

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    Quote Originally Posted by Herman View Post
    Take the wire off after the switch and see if the voltage comes up to 12v, this will determine load is pulling the voltage down, if it stays at 4.5v then it is a bad connection. Is it the one pump that feeds the whole water system or is the toilet on it's own pump.
    There is just one pump for the whole system. The water pressure is fine, its just that I dont think that 4.6v is enough to operate the electric valve. The low voltage is evident right the way back to the fuse.

  4. #4

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    It must be a poor connection in the supply circuit somewhere.

    I would try reseating the fuse for that circuit in the Sargent distribution box as a starting point.
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    Thanks RoaminRog thanked for this post

  5. #5

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    Quote Originally Posted by POI Admin View Post
    It must be a poor connection in the supply circuit somewhere.

    I would try reseating the fuse for that circuit in the Sargent distribution box as a starting point.
    Thanks Chris, will try that in the morning.

  6. #6

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    My push button switch developed a fault on my last van. It would work OK but would not stop when I released it and had to use the control panel to turn it off. They are a bit cheap and nasty, so I would try a new switch.
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  7. #7

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    Quote Originally Posted by maingate View Post
    My push button switch developed a fault on my last van. It would work OK but would not stop when I released it and had to use the control panel to turn it off. They are a bit cheap and nasty, so I would try a new switch.
    Rog has tested the voltage before the switch so that rules that out as the fault.
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  8. #8

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    Quote Originally Posted by RoaminRog View Post

    Can anyone throw a light on where to look next please.
    Haven't you anything to go on?
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  9. #9

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    I had a problem like that. Taking the in-line fuse out and putting it back in cleaned the contacts enough to fix the problem.
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  10. #10

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    According to another website, the minimum operating voltage is 10.5v (maximum 15.5) so I think I am looking for a bad connection or corrosion somewhere in the supply wiring.
    It may be easier just to run a new wire from a reliable 12v source.

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