Some common problems with Fluidmaster toilets include the toilet fill valve running nonstop. Another problem is the water failing to fill up the tank after flushing.
Other problems include ghost flushing, the toilet flapper failing to seal completely and water leaks. The majority of these problems can be fixed by homeowners, although some do require new parts.
If the toilet fill valve does not stop running, the seal valve should be checked for any debris that could be causing to it not seal correctly. If this does not fix the problem, a new valve seal may be needed.?
If the toilet tank does not fill up, the height of the fill valve may need adjustment. This is fairly easy to do by lowering or raising the chain. This may need to be done several times before the right height is achieved.
If the toilet is ghost flushing, the flush valve may need to be tightened. If the valve is tight, there may be a leak somewhere in the system, but if the flush valve is causing the leak, it should be replaced.
For water leaks, check the bolts and all fittings. The tank bowl should also be checked to ensure it is tightly in place. Check the wax ring under the toilet bowl as well to ensure the seal is intact.