How can I repair flush in a Thetford cassette toilet?

Can anybody help my Thetford cassette toilet. When fill the cistern to the overflow.now the cistern is full. My first flush fills the bowl almost to tour the top. After the first flush the rest of the flushssh are fine.Why does the first flush fill the bowl. ?

Raymon Scott
June 2017

how can I remove the pump on a c 250 cassette toilet in senator 2009 series 6 please

david
May 2015

Adjusting the seat for tightness how do I do this on a c-250

Brenton
May 2015

I have brought second hand C2 thetford cassette toilet but there are right side of intake water bottle i need left hand intake from doorway ?

Royston Westgate
June 2013

Hi can anyone help my c2 toilet wont flush I checked the fuse that's ok so I checked the pump that was not working so I put a new pump in but I cant find any power to the toilet anyone know were to look thanks nigel.

nigel
May 2013

hi, can any one help i have a cassette toilet that seems to work fine when i put water in the clear glass stem, but does no take the water from the chamber its suposed to come from that holds the blue fluid

craig
December 2012

For the manual flush take out the handle and pump lug will have broke at bottom hold together with plastic tie now works good

richard
August 2012

I have a vanroyce 518/4 with thetford cassette toilet. The pump has been tested and ok, and the fuse is ok, but no power to toilet to allow it to flush. Is there another fuse, the fuses on the cooker pannel seem ok.

Any ideas . please

ray
July 2012

can i convert a thetford c200 electric toilet to maual flush ?? thank you

pete cooper
September 2011

I have a manual flush loo, no electric pump...it has lost some suction and hardly flushes...can anyone help?

Clare Parker-Twist
July 2011

hi i just purchased a c200 auto flush toilette but i need to know the connections of the electrical pump. can anybody help me

willie
April 2011

I had the NO FLUSH issue, I first checked the fuse, then the pump, had a seized impellor that was it fixed easily. The vehicle was stored for 3 months.
This site a great help

Aussie John
March 2011

Never assume that it's the pump. It's protected by 3 amp fuse accessed after taking out the cassette. Thetford site shows unit upside down to indicate fuse position. Replace and your problems SHOULD be over. However if this is not the case then remove toilet roll holder and unscrew 1 clamp screw and lift pump to turn it over. It should rattle if it's free. If not then tease it through the hole in bottom. A little cooking oil will lubricate it. If this too fails then go to a motor factor with the broken pump and ask him to supply as near to it as he can. This will be a screen washer pump. You will also need to purchase heat shrink joints to rewire. Will be £££s cheaper than C2 pump. Currently £49 !!

David Wirral
January 2011

manual pump system there is no suction does any body no how to fix

rob sanders
January 2011

Hi there i might be able to help as i am having the same problem. As you are looking at the loo there is your loo roll holder on your right! take this then twist the cup out, there you will find your pump! please make sure you have emptied your loo first.(speaking from experance). If you can cut the wires making sure you leave enough to connect them later. un screw the screw to release the pump then connect it to a 12v battery if it does not buzz then you know thats ya problem.Dont be fooled into thinking you have to buy a thretford part, you can buy of the shelf pumps that work just as good for £11.99., hope this helps you out. cheers

karl
October 2010

Hi, can anyone help?
My thetford flushes by the button but for some reason the switch thing underneath does not turn to open the hatch of the toilet so when you flush it just fills up the bowl and stays put.
Then comes the hassle of pulling out the cassette and flooding the place.
No-one has used the toilet yet so we all have to go out in the dark..

gary
September 2010

superb information great help thanks very much

John Andover
August 2010

Just follow Sussex Chris advice of May 2009!! Our 1993 motor home was bought second hand and the laast thing to repair was the Thetford Casette pump. Had no idea about pulling out the toilet roll holder till we read it on this site. Brilliant! Thanks to all concerned!

Ann, Bill, N. Yorks
June 2010

Yep Thanks all a 5 minute job! Rotated pump by hand

Carl
May 2010

I have the new Thetford C250 in my Senator and this winter, despite emptying the flush tank, the pump froze. This new C250 does not use a submersible pump, but puts a fully sealed unit at the bottom of a U-bend, so it never runs dry. However, this means that the pump can easily freeze. There is a drain pipe to empty the tank, but not the pump, it always has water in it. After removing the cassette and taking off the short bottom hose, I pulled the blue pump and U-bend down to inspect. Although fully sealed, it was possible turn it sideways and pour a little oil up into the impeller. Then with a short length of 6mm dowel in my portable electric drill, I pushed it up into the pump. The soft wood engaged with the impeller and a few revolutions counter-clockwise, freed off the jammed pump. It worked. Next winter I will remove the bottom hose to ensure the pump does not freeze again. Thetford should install a drain cock here.

Kevin Barrett
January 2010

my thetford is a built in model 1989 and the blade is very very stif to move , the previous owner said they have replaced the seals could he have used the wrong seals ,any other ideas , thanksroger

roger
November 2009

A fairly easy way to do this (on the C2/3 model is to check the fuse (under fixed shelf with the waste tank out) this is a small round holder that unscrews, replace if needed, then remove the loo roll holder as it just pulls out, use a torch and pull off the large tube to the top of the motor, you should see a cross head screw, undo this and remove the pump by pulling the wire out. Hold the motor, and pruss the flush button, if you feel the motor jump a bit in your hand you have a duff pump. Before replacing it, turn it uver and you should be able to put a small screwdriver into the bottom and turn it (no direct screw hole, but you can push the vanes), turn it a few times, then press the flush again, if the motor spins, replace it, refit the screw and flush pipe and test. Took me about 20 mins! thanks to this forum, but the info in this posing is set out in several places. Hope this helps.

Sussex_Chris.
May 2009

Please could someone help?
we have just bought our first caravan
and i can not get the toilet to flush
i have checked and replaced the fuse which was melted , the is no light showing dim ect
removed the cover and checked wiring to switch but know run out of options
any help will be greatfull ?????
thanks

Dave .

Dave
March 2009

My c2 had same problem. Pulled pump pressed pump sw and felt motor trying to turn. impeller hard to turn but after several revolutions by hand go motor to turn slowly added olive oil to impeller area continued hand spinning and got it going. Saved mega $$. thanks

Richard
June 2008

wd40+spin by hand helped me too

Galli
June 2008

Problem whilst on holiday last week. Thetford loo would not flush. Checked wiring,fuses and switches with cassette removed and ok but motor would not turn. Went to a caravan shop for new fuses to try and luckily, their fitter was in the shop. Spoke to him and he told me how to access pump as detailed earlier. I had visions of stripping down the washroom to access and was making contingency plans to use the shower head to flush the loo as a temp measure. Apparently it is a common fault and usually cured by draining the tank, easing the pump from the tank, not pulling on the cable, and spinning the vanes on the impellor. It is suggested elsewhere, to lubricate the pump with WD40 but this is a mineral based product that can actually rot rubber products and would be better advised to lube useing vegetable cooking oil. While you are at it, put a drop or two around the seal of the cassette unit and work the sealing flap for smooth operation.

Andy Clarke
June 2008

I have just bought a caravan, which has a thetford cassette toilet c-200cw in it . We have sorted out how the cassette works, but havent a clue about the toilet. is it supposed to have a proper flush on it because when i press the flush down only the cleaning fluid comes out.

dawn
June 2008

A thought or two for Arthur. Have you checked the operation and wiring to the second microswitch which is an interlock to prevent the pump from flushing when the cassette is removed. This is visible when you remove the cassette and look up to where the blade opening knob slides in. There is a microswitch up there which rotates every time the blade is opened which flexes the wires. Mine eventually broke. As a new loom is circa £20 and fiddly to get too I just by passed this microswitch and make sure no one flushes the loo when the cassette is out.

If this does not work I suggest that you disconnect the wiring to the pump and connect it directly to 12v. This will at least tell you if the pump is burnt out before you spend circa £30 for a new pump.

Dave
October 2007

I've had the exact fault Frank's had, after doing the same thing , but have delved a little deeper , without success. I removed the submersible pump and it rotates freely ,the 3A blade fuse at the cassette interlock is fine , as is the microswitch on the press flush . The 15A main fuse in the vans fusebox is also ok , but when i check for a 12v supply at the 2pin connection in the toilet cassette compartment i can't find one ??
Can any Thetford Guru out there help !
Cheers , Arthur.

Arthur
October 2007

i have just repaired my pumpas david suggests in his reply to you.i took the pump out and gently rotated the motor spindle with a pair of snipe nose pliers,i added a little w.d. 40 and it eventually started again.my problem was i have recently bought my caravan and it had been stood for 4/ 5 years and it had seized up,it works fine now and saved me spending around £27. hope this helps you tony.

tony
October 2007

A few thoughts based on my experience on my Thetford which is a C4 unit.
Have you checked the fuse which is usually visible when you remove the cassette?
You have refitted the cassette as the unit will not flush with the cassette removed as there is an interlock preventing this.
The wiring broke on my unit where the interlock microswitch is. Check this by removing the cassette looking up to where the rod is for opening the blade valve and ensure the wires asr still connected. Lastly if this all seems ok you can get to the pump by removing the spare toilet roll holder, taking out the "pot" its in and below is the pump. Try gently tapping this whilst operating the pump switch. If this fails remove the pump a philips type screw holds it in place and try rotating the small rubber impellor. Hope this is of help.

Dave
August 2007