If you have tried dual flush toilet cistern lid removal you may have found that it was held down by something. But what? There are no clips or screws.
Traditional porcelain cisterns flushed with a handle have their lids held down by gravity.
Some Dual Flush toilet cisterns, like my Armitage Shanks1 Ascania have their lids held in place by the Geberit Flush Button Mechanism2. The Button Socket, mounted in the cistern lid, is held down by a plastic screw attached to an internal part within the cistern.
This article gives advice on this type of dual flush toilet cistern lid removal.
Armitage Shanks Ascania Dual Flush Toilet Cistern Lid Removal
How to achieve dual flush toilet cistern lid removal on my Armitage Shanks1 Ascania cistern.
Start by extracting the two buttons from their socket.
Extracting The Dual Flush Buttons
Push one button down all the way and keep it down (the toilet will flush). Turn your finger so that your fingernail engages with the side of the other button. Both buttons have a finger nail notch on the side. Dig your nail into the notch and pull out the button. The button will click out of position ready for removal from the socket. My buttons have a long thin rod of plastic attached which reaches down to operate the real buttons inside the cistern. Be careful not to break them.
Now with your forefinger of the other hand engage your fingernail in the other button in the same way and pull it out with a click.
The Button Socket (Silver Cup)
Look into the socket and you will see a plastic screw that has up to now escaped you. It is the one that holds the lid on. It shouldn’t be over tight. unscrew it anticlockwise with a screwdriver having a wide flat blade 1mm thick. Don’t chew up the soft plastic of the screw.
The button socket mounted through the lid has no thread in the screw hole. The screw is just a tight fit. The thread into which it screws is in a flat plastic Sliding Plate held aloft by a frame, referred to as a bridge, attached to the flushing module/valve below the Button Socket. See the detail below. With the screw removed the cistern lid should lift off and the Button Socket can be removed from the lid by pushing it out from underneath.
Wash and clean all parts before reassembly.
NOTE: Cleaning fluids running into the Button Socket drain through holes into the cistern for flushing away.
You can see all the parts below:
The Sliding Plate In The Bridge
See the cistern below with the lid removed and the internal parts labelled. The Sliding Plate in the Bridge (height adjuster) moves around horizontally so that its holes align with the Button Socket in the lid. Be careful not to accidentally push the Bridge down. It ratchets down easily but is hard to draw back up. Ultimately it needs to sit just below the Button Socket. The Sliding Plate also has two holes through which the Button Rods3 pass on their way to engage with the real buttons below. Align the holes in the Button Socket (silver cup) by removing the rods from the buttons and using them to keep the holes aligned while tightening the screw.
NOTE: If the cistern lid has been pried off (or just forced upwards) by someone who doesn’t know how it is held in place the Sliding Plate could be cracked or broken and will then need replacing2.
Flushing The Cistern With The Lid Off
To flush the cistern with the lid removed poke something suitable through the holes in the Bridge’s Sliding Plate and use it to push the flushing buttons down, e.g. use a button with spindle attached, a screwdriver or press with a finger where space permits.
1. How to change a Geberit Flush Button and Valve
Here you can see a plumber performing a dual flush toilet cistern lid removal while working on a Geberit Flush Button mechanism:
2. Encyclopedia of Toilets
1. Armitage Shanks are now part of Ideal Standard.
2. Parts for the Geberit Flush Button Mechanism can be obtained from Amazon as follows:
These parts may also be available from builder’s merchants, DIY stores and hardware shops.
3. Button Rods are cut to length according to the size of the cistern that the flush valve is installed in. The rods are hollow and so stainless, brass or nylon screws may be inserted into the bottom of the rods to make their length adjustable, particularly if they are cut too short.