Grohe Concealed Cistern - Very very slow weep into pan

[steveoelliott]

Hi,

 

I have a 1 year old Grohe concealed cistern which appears to have a very slow weep into the pan when not in use. I already checked the level is not near the overflow and both the fill and flush valve have been replaced. The only thing that hasn't is the little cage at the bottom of the cistern that the flush valve pushes into but I'd be surprised if this was the culprit given there are no moving parts to this.

 

Now when I saw weep, it is hardly noticeable. I don't even see a drip but it does show on toilet paper if the pan and the area where water enters the pan comes into contact with it.

 

My question is, should this be bone dry a couple of hours after the last flush? Is it normal to have a slight weep?

 

Thanks in advance.

[Mr Punter]

I have found that they all leak.  I have used several makes.  We are in a hard water area so it may be the scale that kills them.  Just had to refund over £100 to a tenant because she has said her water bill is high due to a leaky cistern.

[steveoelliott]

3 minutes ago, Mr Punter said:

I have found that they all leak.  I have used several makes.  We are in a hard water area so it may be the scale that kills them.  Just had to refund over £100 to a tenant because she has said her water bill is high due to a leaky cistern.

Well, mine is under warranty from Grohe so I could defer to them to fix it but it might just not be fixable. 
 

My Thomas Dudley concealed cistern downstairs also has a very slight weep, but that’s much older

[steveoelliott]

@Mr Punter So Grohe came back to me and they are going to send a senior engineer to look at it. They mentioned removing the pan but I can't see why they need to do this and how it will help. Given that the pan is not Grohe and has been in place for over 10 years, I am reluctant to let them touch it and will refuse. IMO the issue with weepage can be troubleshooted from the cistern. You can imagine, what would happen if something went wrong and the pan got damaged, leaked later etc.

Edited 15 hours ago by steveoelliott

[Nickfromwales]

If you take the flush valve out, then look at the lowest point, you should see the soft rubber seal. Take that off, turn it 180^o and then put it back on. This should be sufficient to sort the water passing the seal.

 

It's on the Geberit website / vid's as their '10 year' maintenance or something....

[steveoelliott]

7 hours ago, Nickfromwales said:

If you take the flush valve out, then look at the lowest point, you should see the soft rubber seal. Take that off, turn it 180^o and then put it back on. This should be sufficient to sort the water passing the seal.

 

It's on the Geberit website / vid's as their '10 year' maintenance or something....

Thanks. I don’t suppose you have the link handy?

[Nickfromwales]

58 minutes ago, steveoelliott said:

Thanks. I don’t suppose you have the link handy?

It’s basically a short video just showing exactly this, remove flush valve, switch the rubber around, and refit. 
 

Same vid for the different models iirc. 

[steveoelliott]

Thanks @Nickfromwales

[saveasteading]

I did the turning over and regretted it.

Mine is Roca.

I removed the rubber washer, cleaned it, reversed it and refitted.

What was a strong trickle was improved to a slight trickle. It could be stopped by jiggling the flush to give it another chance to reset.

So I bought a new washer and it's fine now.  

It wouldn't be a big deal but it's such a fiddle fitting in there....and I dropped a very particular  connecter in and lost it.

(Expanding plasterboard plug to the rescue).

My ongoing concern is that the washer 'mates' with an outlet that may get mucky with lime but is unreachable.