ᐅ The Geberit air admittance valve closes much too quickly.
Created on: 9 Oct 2024 14:14
H
Häuslebauer124H
Häuslebauer1249 Oct 2024 14:14Dear Forum,
In 2015, a Geberit concealed cistern with dual flush buttons was installed in my home. Unfortunately, behind the access panel, I could only find the part number for the flush valve seal (816.418.00.1). Everything worked perfectly until Easter 2024. Gradually, the flush valve lowered more quickly during the larger flush, until it now flushes for about the same duration as the smaller button.
Since I don’t have a part number, I will briefly describe the opening procedure:
The actuator plate is slid upward and removed. Then, on both the left and right sides, a blue slider must be pushed up or down to unlock two levers. Both levers can be rotated 90° and pulled out. This allows removing the black mounting bracket. Behind it is a white wall which can be removed at two levers on top. After that, the bracket for the actuation levers is unlatched and removed. To remove the flush valve, both blue lift pins must be bent off the valve (otherwise they won’t fit through the inspection opening) and a gray/black holder on the rear wall that holds the valve in place must be unclipped.
I cleaned the flush valve, but after reinstalling it, there was no improvement. The valve is set to 6 liters (1.6 gallons). It can also be adjusted to 4.5 liters (1.2 gallons) or 7.5 liters (2 gallons). Since it worked fine at 6 liters for 9 years, I left it as is (I don’t want to break anything). Above this adjustment, there is a blue control with “+” and “-”. The slider part was centered. I moved it fully to “+”. That also did not help.
Other solutions found online suggested that the lift pins were too long and touched the rear wall. However, my toilet worked fine for 9 years, and the flush duration gradually shortened over about six months until it is now as short as the small flush. Of course, by pressing the large or small button longer, the flush process can be extended.
Sometimes, the cistern flushes normally for one or two flushes if I open it beforehand. It must be something small.
Thank you if you have read this, and I look forward to any responses.
Best regards
In 2015, a Geberit concealed cistern with dual flush buttons was installed in my home. Unfortunately, behind the access panel, I could only find the part number for the flush valve seal (816.418.00.1). Everything worked perfectly until Easter 2024. Gradually, the flush valve lowered more quickly during the larger flush, until it now flushes for about the same duration as the smaller button.
Since I don’t have a part number, I will briefly describe the opening procedure:
The actuator plate is slid upward and removed. Then, on both the left and right sides, a blue slider must be pushed up or down to unlock two levers. Both levers can be rotated 90° and pulled out. This allows removing the black mounting bracket. Behind it is a white wall which can be removed at two levers on top. After that, the bracket for the actuation levers is unlatched and removed. To remove the flush valve, both blue lift pins must be bent off the valve (otherwise they won’t fit through the inspection opening) and a gray/black holder on the rear wall that holds the valve in place must be unclipped.
I cleaned the flush valve, but after reinstalling it, there was no improvement. The valve is set to 6 liters (1.6 gallons). It can also be adjusted to 4.5 liters (1.2 gallons) or 7.5 liters (2 gallons). Since it worked fine at 6 liters for 9 years, I left it as is (I don’t want to break anything). Above this adjustment, there is a blue control with “+” and “-”. The slider part was centered. I moved it fully to “+”. That also did not help.
Other solutions found online suggested that the lift pins were too long and touched the rear wall. However, my toilet worked fine for 9 years, and the flush duration gradually shortened over about six months until it is now as short as the small flush. Of course, by pressing the large or small button longer, the flush process can be extended.
Sometimes, the cistern flushes normally for one or two flushes if I open it beforehand. It must be something small.
Thank you if you have read this, and I look forward to any responses.
Best regards
H
Häuslebauer12410 Oct 2024 08:51Thank you for your response! So the rubber seal causes the lift bell to lower too quickly? I always thought the rubber was there to ensure a watertight seal between the cistern and the drain.
H
Häuslebauer12410 Oct 2024 09:24Problem solved, I should have figured this out myself:
Thanks to Philipp’s reply, I realized that I can swap the flush valve with one from a different cistern. The valves only differ in their open (+) and closed (-) positions. The flap must be closed, so it should be set to the “-” position. Then the flushing works with both valves. For some unknown reason, on the faulty toilet the control part had been set to a middle position. I had set it to “+,” meaning the chamber was fully open—so it was upside down! The chamber must be closed (see photo)!
Thanks again, Philipp—even if your comment was complete nonsense.
Thanks to Philipp’s reply, I realized that I can swap the flush valve with one from a different cistern. The valves only differ in their open (+) and closed (-) positions. The flap must be closed, so it should be set to the “-” position. Then the flushing works with both valves. For some unknown reason, on the faulty toilet the control part had been set to a middle position. I had set it to “+,” meaning the chamber was fully open—so it was upside down! The chamber must be closed (see photo)!
Thanks again, Philipp—even if your comment was complete nonsense.
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