Question about Thetford Porta Potti

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We have a thetford C200cs on the motorhome we have just bought (2003). No water seems to pump, & the blue flush button doesn't seem to work. Are there any instructions availabe? The fuse has been checked & is OK. Does the led come on all the time, or only when flushed? (which it won't do) VC

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Red light is just a reed switch that turns on the LED when a floating magnet inside the cassette floats up (when the cassette is full) and switches on the reed switch thereby switching on the LED. It just tells you the cassette is full and you need to empty it.
I'd say either your button or electric valve is broken. All the button does is allow the electric valve to break the seal that allows water to flow from your onboard water system.
I'll assume that the water in the rest of your motorhome is working?
So check the switch first.
You can lever off the switch/LED panel and remove the square connector from the back of the button. Get a multimeter and set it to either Continuity or Resistance (Ohms). Place the connectors on 2 of the switch pins and press the switch (the switch is actually 2 switches with 4 pins, but each pair of pins is connected together) - if you get a beep (if multimeter on continuity) or low resistance reading (if on resistance) then the switch is working - if this is the case then it's probably the electric valve. If the switch is not working, then that's your culprit.
When you replace the connecter you can replace it either way round.

Posted on Apr 21, 2010

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Our c200cs only has the red light come on when it is three flushes from a full waste tank as an indication to empty it. Our van is 2008, so the model may have changed, but I doubt it.

Posted on Feb 15, 2010

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1 Answer

My flush has stuck on, how can this be sorted.?


Close the Inlet Water valve to the Flush Tank.
Remove the lid on top of the Tank cover.
Check the link/chord connecting the flush knob and the Flush valve.
It might be broken.
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Don't send money. Just go to thetford.com and download info.
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Nov 04, 2009 | Thetford Porta Potti

1 Answer

Casset toilet will not pump water for flush


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May 27, 2009 | Thetford Porta Potti

1 Answer

When I flush, no water comes out?


Open door, remove toilet cassette unit, look in under flush water tank, observe a short metal blade that actuates a safety switch. This is between two plastic guides. Now look just outside the right hand guide. There you will find the fuse which is a standard blade type. Just pull it down to remove from holder. You will probably find it rated at 3 amp. If it is blown you will probably have to replace pump. Looks difficult but is actually dead easy. Instructions come with replacement Thetford pump. Only problem you may have is a perished sealing ring on the paper holder cup which is no longer available as a spare. Just use a good quality outdoor type sealant as a replacement. Be sure to recover any bits of broken ring from the flush water tank as these can be drawn into your replacement pump and cause it to sieze. At minimum this will cause you to say bother!

Happy repairing.

May 21, 2009 | Thetford Porta Potti

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