Question about Thetford Porta Potti

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Casset toilet will not pump water for flush

Toilet will not flush, could this be a fuse? if so where is it?

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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.

Posted on Jun 13, 2009

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  • p_t_r_thomps Aug 05, 2011

    fantasic, advise very helpfull and fixed our problem,
    THANK YOU x

  • hluczka
    hluczka Jul 08, 2013

    check the fuse but still not working any other help????PLEASE...

  • JohnLong Jul 08, 2013

    There are several possible causes of failure to operate when the fuse is good.
    The easy one is a low battery voltage - just try putting the battery on charge. Usually everything else seems to be working fine but these pumps are not happy if the battery voltage is a little low.
    The next action to take is to check the wiring continuity. Regret I can't be specific about this because caravan wiring differs from model to model and sometimes from year to year. Try to locate the low voltage distribution terminal blocks and make sure all connections are good. Make sure that none of the wiring has its insulation trapped inside the terminal block under the terminal screw. You may be able to trace the wiring to the PortaPotty by the colour of the wiring insulation. If not try disconnecting each terminal in turn to see what stops working. If nothing else stops you have probably found the correct wiring and should be able to inspect it up to the PortaPotty fuse. If you have the use of a multimeter you will be able to check the wiring and pump for continuity. It is equally important to check the return wiring from the other side of the pump to ensure that this is connected to the other battery terminal. The return may be by a terminal bolted to the caravan chassis so make sure that this is not corroded - alloy chassis are particularly prone to develop a thin protective oxide layer. This should be cleaned off under the terminal and an electrically conductive grease used to prevent further corrosion. Copper Ease is probably as good as any.
    Good hunting.

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