Geberit system hissing - internet says might be a diaphragm?

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irfaan

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Kindly see the video attached. The toilet will often go into a mood and start hissing. This will go on until I manually operate the filling mechanism to fill the tank higher.

I suspect that it is somehow not filling enough and then slowly leaking until a point where it just triggers the filling mechanism to create the hiss. However, there is no leak into the bowl, and I do not know why the top of the post in the video is spurting water.

Hiss is about 4-seconds into the video.

I appreciate your help!


Thoughts?
 
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Terry

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It would be very hard to "see" water going into the bowl.
Turn off the water supply to the toilet and let it sit for a while. Does the water level in the tank go down?
If so, there needs to be a flapper/Seal repair to the flush valve.

With the water on, the fill valve should shut off about 1/2" below the overflow.
If the fill valve is stuttering, there may be a filter that can be pulled and cleaned. Though if you are losing water in the tank, the valve may stutter as it tries to complete the fill too.
 

irfaan

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So - to update almost a year later...

Looks like there is a slight leak into the bowl (tested with food colouring), but the hissing stopped a couple months after my initial post and doesn't seem to have returned. A local plumber suggested that it might have been something to do with air bubbles in the vacuum-tube (? -- far left in the video) slowly clearing over time, now finally cleared.

I should have thanked you a year ago for your quick reply - my apologies for having not done so. Thank you!

I will let you know if anything else comes up. Thanks again!
irfaan
 
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