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Topic: Toilet flush trickling

black-major

20/5/2023 at 5:39pm
Location: BIRMINGHAM
Outfit: LUNAR LEXON 530

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Hi Everyone guidance needed

we have a lunar clubman 2012 with a c250 toilet

issues started with the flush pump not working , so watched a video on youtube to how to fault find and clean and refit to which cured the problem

i noticed the toilet bowl was starting to fill up due to the flush nozzle trickling after flushing , so i was told the flush valve underneath the toilet housing needed replacing as it was stuck open and a common fault

stripped the toilet out only to find our doesn't have one as its just a direct hose from the pump in the water tank to the flush nozzle

i have rechecked the pump to make sure the pump goes off once depressed and it does , but it still trickles even with the eletric off

am i overlooking something as i cant seem to figure it out

tango55

20/5/2023 at 8:10pm
Location: Lichfield
Outfit: Coachman Amara 450

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As the pump is inactive there must be pressure remaining in the system which is causing the constant trickle which could be related to the missing valve. Maybe a previous owner took it out due to the common problem as stated but if there is one shown in the YouTube video it must have been a standard fitting by Thetford.

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trog100

20/5/2023 at 11:08pm
Location: None Entered
Outfit: None Entered

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its probably syphoning.. the valve is may be to stop that..

trog

Pickled Onion

21/5/2023 at 10:35am
Location: Near Alton Towers
Outfit: Bailey Burgundy S7 H

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It could be that there is a bit of detritus trapped in the pump holding the valve slighty open and allowing it to trickle. Perhaps worth a look, you could try removing the pump so that yopu can blow through it, it should only do it one way, both ways then that's the problem.

Dave.

-------------
Give a man a fish and he will eat for a day,
Teach a man to fish and you can get rid of him for a whole weekend.

black-major

21/5/2023 at 12:17pm
Location: BIRMINGHAM
Outfit: LUNAR LEXON 530

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thanks for the replies

going to replace the flush pump in the water tank to see if this cures the issue , it looks like the original one and never has been changed or replaced

just looked on the net and they are £24.99 for the Thetfford type complete with grommet and soldered connectors

trog100

21/5/2023 at 3:56pm
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you have a pump submerged in water.. the pump picks up the water and pushes it via a pipe to the toilet bowl and squirts it out..

all very simple and i do find it hard to think of any reason why it should still trickle when the pump is switched off..

i replaced mine (seized motor) with a cheap none branded pump costing about a fiver.. at £24.99 you are paying for a brand name still it should work even if somewhat overpriced..

i did cut my thetford one up just to see what was inside.. nothing special just a cheap as chips motor similar to my five quid one..

trog

Mick S.

22/5/2023 at 8:23am
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c250: is this an 'older' toilet? Im intrigued by the mention of a 'flush valve'. Do all toilets have one? I had the operation down as 'pump in water, press button, water is pumped round bowl'. Thats it?

Pickled Onion

22/5/2023 at 4:31pm
Location: Near Alton Towers
Outfit: Bailey Burgundy S7 H

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Well spotted Mick, the toilet pump doesn't have a non-return valve, it uses a vacuum breaker to prevent it syphoning as trog suggested.

Here is the link

The C250 is mounted outside the tank above the cassette door, the C260 in in the flush tank.

Dave.

-------------
Give a man a fish and he will eat for a day,
Teach a man to fish and you can get rid of him for a whole weekend.

black-major

22/5/2023 at 4:46pm
Location: BIRMINGHAM
Outfit: LUNAR LEXON 530

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thanks Dave i will do more investigating

Monty15

22/5/2023 at 5:11pm
Location: London
Outfit: Lunar Cosmos 524

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You might find the documents like spare part exploded diagrams available on the Thetford web site very useful: https://www.thetford-europe.com/gb/welcome-thetford-support/c250-series-cassette-toilet

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