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New cistern leaking into pan

Discuss New cistern leaking into pan in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Leigh Florence

Leigh Florence

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I have replaced a whole new Grohe WC wall hung toilet integrated frame and cistern and still have the same problem, a small leak into the toilet pan. Going crazy as no one can tell me why this is happening. Grohe thought it was their problem even though had not experienced it before, but multiple changes (3) of the parts you can change through the flush panel occurred on the first frame, and then a whole new frame and cistern was sent and installed. But still the same leak - A small trickle that continues hours after flushing. Apart from water wastage the problem is unworkable as the toilet is connected to a macerator, so every 6 hours or so it goes off. Please help, it can't be a faulty cistern, so what else could be causing this trickle? It is new! There is no degradation of the fill valve. What else can i replace?

Any help really appreciated.
 
Hi thank you for responding. Who sets the water level? Sorry i am ignorant. I've had two Grohe engineers round and two different plumbers and none of them have mentioned water level. Where would this be set, inside the Grohe frame?
 
When the toilet was off, a just the pipe was sticking out from the cistern, it didn't seem to be leaking. Once the toilet is on starts leaking.
 
Have you got very high water pressure ? did a restrictor insert come with new inlet valve.
 
Wish i could answer these questions, again none of the people that visited did anything, or questioned anything, and rather just change the constituent parts. Photo attached. Can't really get phone inside.

IMG_20180126_190910_resized_20180126_070948626.jpg
 
Can you see what the flexi connects to on the other side? Is it a float? The syphon might not be fitted correctly also? Bit more likely the inlet valve
 
Harvest Fields said:
Can you see what the flexi connects to on the other side? Is it a float? The syphon might not be fitted correctly also? Bit more likely the inlet valve
Click to expand...
Hi here is another picture! I've come to think it's nothing to do with the cistern or frame because everything changed multiple times. Can it be something else? Don't think water pressure particularly high.

IMG_20180126_193153.jpg
 
I feel your pain, it is all new and the Grohe guys can`t fix it :mad:
There must be warranty so call them back and lock them in until they do ;)
 
Not what you wanted to here Leigh , but those pics bring back nightmares for me , last summer I had hours trying to sort a problem with one of those valves / cisterns. I ended up slinging it and putting a different cistern in , and I love Grohe gear
 
Grohe have just coughed up over £1k to take toilet, sink, tap off off decor panel, remove panel and shelf and flooring to get to frame. Paid for frame to be replaced and everything to go back. This is after paying for 3 goes at changing innards. Grohe have been amazing. Problem is none of it has fixed the problem! That's what makes me think nothing to do with frame. But sounds like you are all saying it must be.
 
I just want someone to tell me, it has nothing to do with the toilet you bought, and nothing to do with the fact that toilet connected to a macerator, and nothing to do with anything my plumber has done fitting it. Then the only thing it possibly can be is inside the Grohe frame and cistern.
 
Really struggling to understand why the frame was replaced tbh unless they know something I don't.

Nothing to do with your pan or the macerator fault ls inside the cistern.
 
only thing if can be is the syphon isnt sealing properly and allowing water to pass into the pan or else the water level too high in the cistern and its overflowing into the pan!
 
townfanjon said:
Not what you wanted to here Leigh , but those pics bring back nightmares for me , last summer I had hours trying to sort a problem with one of those valves / cisterns. I ended up slinging it and putting a different cistern in , and I love Grohe gear
Click to expand...
You're right Margaret, don't want to hear it!
 
Does it still leak into the pan with the float valve switched off? Maybe leave it over night with it switched off. If it does then the flush valve must be the culprit.
 
rpm said:
Really struggling to understand why the frame was replaced tbh unless they know something I don't.

Nothing to do with your pan or the macerator fault ls inside the cistern.
Click to expand...
They couldn't understand why it was still leaking after everything changed and insides investigated. Thought perhaps moulding around bit that opens not right, and that is part of the frame. Maybe it's their engineers that just don't know what to test.
 
The silver flexi that you show in the photo on the left hand side,follow that flexi back to the right hand side and take a photo
 
There will be an isolation valve either inside the cistern p, connected to the silver flexi or just outside the cistern. This should be accessible to you.
 
Grohe make great taps but their toilet cistern innards leave much to be desired. A £50 toilet to go with a £20 fluidmaster pack put in it would outlast their stuff by a decade.
 
Rightjob1 said:
only thing if can be is the syphon isnt sealing properly and allowing water to pass into the pan or else the water level too high in the cistern and its overflowing into the pan!
Click to expand...

This is it. One or the other. Either don't flush toilet overnight and see if water level has reached internal overflow level or turn off water to toilet and see if cistern slowly empties itself. First one = inlet valve second one = Flush valve/flush valve seal. Could be both but sounds unlikely with brand new stuff. Not uncommon to see both valves gones after 3-5 years on over-engineered garb.
 
Thanks everyone so much for engaging with this and me. I won't turn the macerator off, thanks rpm. Have you seen Margarets photo!
 
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