Water is leaking from between the pan and the cistern. How is the problem rectified?

Will the Roca semi-recessed basins fit to any other manufacturers bathroom furniture?
Why does water continue to flow into the pan after flushing?
Why does the push button cistern when operated continue to flush and not close and fill up (old installation)?
Why does the pan/cistern installed not take waste/paper away?
Why does the cistern take minutes to fill after it has been flushed?
When using the Aquatech, water flows out through the overflow underneath the seat in the unit. Why does this happen?
When the toilet is used, the toilet cover will remain upright but not the actual seat.
When the buttons are pressed on the push button cistern, you have to keep your finger on the buttons. How can this be rectified?
Water is leaking from between the pan and the cistern. How is the problem rectified?
There are small scratches/marks on an acrylic bath. What can be used to get rid of the marks?
There are rust spots on the base of a bolt on legged steel bath that are situated in any of the four corners.Is the bath faulty?
The whirlpool function on a hydromassage bath does not work. Why is this?
The plumber installing a cast-iron bath states that on the feet pack there isn’t a footplate that the leg attaches to.
The diverter on the manual shower valve is stiff and cannot be moved to select different settings.
The cycle will not start on a hydromassage bath with a self-clean function.
The back-to-wall pan that has just been installed is leaking from the inlet joint (flush cone).
Sometime after installation, the acrylic on the bath is moving/flexing.
On ceramic disc brassware, the tap is constantly dripping.
On a whirlpool bath, nothing happens when the power button on the control panel is pressed.
On a hydromassage bath with a remote control panel, the fixed base is lit, but the remote control doesn’t work.
On a basin with a semi-pedestal, the semi-pedestal isn’t fitting correctly to the underside profile of the basin.
How does the semi-recessed basin template relate to the cutout of the unit?
How can the push button cistern be made more secure when there are no drill holes in the back of it to screw it to the wall?
Can you add a bidet cover to a bidet sometime after it has been installed?
Aquatechs/kits must first be calibrated so they adjust to the water pressure.
What is the configuration of the brackets and how are they fitted?
A steel bath has developed a tiny rust spot/mark.
A cast-iron bath has developed a tiny rust spot/mark.

Water is leaking from between the pan and the cistern. How is the problem rectified?

At the time of installation, the plumber must ensure that when the cistern is offered up to the pan, the close coupling washer must be situated into the recess at the top of the pan. From past issues with customers we know it is likely that the washer has moved during installation that causes the leak.

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