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