Thetford cassette toilet.

[G1098]

Hi, I have a Bailey series 7 Pageant equipped with a C250 CWE cassette toilet. I have just returned from a 4 day mini break and the flush tank at times comes on by itself and empties into the toilet. Luckily I only had about 2 or 3 litres of flush water the first time it happened so no spillage, but the pump kept running until i removed the fuse. It now does it every time so is unusable. Thoughts please.

 

[Mr Plodd]

Sounds like the flush switch is sticking to me. I woukd be inclined to take it out and have a "fiddle" with it.

 

[G1098]

Sounds like the flush switch is sticking to me. I woukd be inclined to take it out and have a "fiddle" with it.

Possible but, at times over the 4 day break it goes 'live'without the flush switch being activated.

 

[Dustydog]

Possible but, at times over the 4 day break it goes 'live'without the flush switch being activated.

As Plodd said . Take vit out , check it’s condition, spray the board and contacts with electrical contact spray, allow to dry and hopefully the short circuit will be fixed

 

[birdman101]

Often you will find this caused by corrosion on the circuit board which is situated inside the top of the tank. If you and take it out, dry off and clean it up and get it to work spray it with some printed circuit board lacquer to keep the damp off. If you do have to purchase a new circuit board also spray that to seal against damp before fitting.

 

[izzy]

had loads of bother with son's C250. pump, circuit board, black bits and prev owners bodges!
hopefully as plod says yours just needs a clean and a fiddle
In the end I had to rip the lot out and fit a manual pump (30 quid) should have done it ages ago
I just mention it as an option that's all

 

[Martin_E]

Try taking the silver overlay off, see if it does it then

 

[G1098]

Thanks for all your advise. I've just watched various YouTube vids and as you all say, the flush switch seems to be the problem and an easy fix. Again, thank you all.

 

[IanB1485]

The flush switch is transistor assisted ,so the switch doesn't take the pumps current, it wouldn't take much of a contamination to trigger the dual transistor IC.The pcb may have got water on the tracks,or around the switch ,particularly as you say it comes on randomly . See attached schematic. The first thing to do is wash the pcb in clean water , distilled if you can get in. A toothbrush can be used to help remove any white deposits ( which is a sure sign of water damage). a final wash with Iso propyl alcohol. rebuild and a quick spray of silicone spray will help keep the water from