I have a uberhaus dual flush toilet. I turned off the water supply in the house to work on a sink and when I turned it back on the toilet won't fill anymore. If I fill the tank or the bowl it will flush but it won't fill. Does anyone know how to fix it?

Do you really think 'toilet' is spelled 'toliet'? You wrote this 4 times.

Replace the water inlet valve. It sounds like it is sticking and you also have very low water pressure. Call in a plumber and get the water pressure test with a gauge.

A dual flush toilet is a fantastic option to save water and make your home more environmentally friendly. Giving you the option for a half flush or full flush at your discretion, you can lower your water consumption while still getting the job done. However, like all toilets, they can present problems that mean the toilet doesn't function as it should. One common problem in dual flush toilets is constantly running. You hear the tank constantly being filled, even when it should be finished and completely full. If your dual flush toilet is constantly running, first check for the top three problems that cause this trouble:
Flapper or Seal Trouble
The flapper or seal is often the culprit in constant running water in both normal and dual flush toilets. Over time, this rubber piece may become brittle or simply misaligned. To check it, turn off the water supply and flush the toilet to completely empty it of water. Remove any remaining water with a sponge or towel. Then, you'll need to remove the flush valve canister in order to access the seal. Once you've found the seal, check to see if there are any cracks in the seal. If there are, you'll need to replace it. Otherwise, check to see if it can be re-aligned to sit nicely in its place. Some homeowners find that applying a bit of Vaseline to the seal can renew it, making it supple and functional again for a while at least.
Debris
Sometimes the water supply isn't as clean as we think. Or, dust and dirt may be able to enter the toilet, causing the fill valve to malfunction. To check it, turn off the water supply and remove the lid from the fill valve. Then, look for any debris and remove it. You may also consider brushing out the valve with a small brush. Once you're certain it is clean, recap the valve and check if the problem has been solved.
Broken Zip Tie
The fill valve in most dual flush toilets has a zip tie to keep the base of the fill valve in place. If the fill valve isn't strongly secured, it can cause the toilet to run. Sometimes these ties wear out or break before the rest of the device does. You'll need to replace a broken zip tie with a new one if you find that it's broken. If possible, you can place two zip ties on the fill valve in order to assure that the base doesn't wobble, causing the leak. Many times these problems are easy for the average homeowner to check for and repair. In the case that you are not able to find a solution to your dual flush toilet's constant running, then you'll need to call in the help of a professional plumber. A high quality plumbing company will be able to help you troubleshoot your dual flush toilet troubles and make sure it's functioning properly again.

Depends upon several things, the most difficult would be too much air in the pipes. Before having a "anti-hammer" installed; I would try this... go to the supply for the cold water pipe (for that room, dependent upon the age and style of your home) maybe the basement??? See if there is a place, other than the toilet, to turn off the water supply (turn the water off), open the cold water valves of your sink and tub and flush the toilet, and drain about 1 quart of water from that line. Leave the tub and sink cold water valves open and slowly open the valve you turned off, allow water to flow from the faucets and flush the toilet a few times. What you are trying to do is allow the air to escape. Turn off the faucets and flush the toilet again, open the partially closed valve all the way. This should get rid of trapped air, and it is the cheapest first step. This is one example of an "Anti-hammer" device.

Note: On some houses it may be difficult to find a place to drain the cold water line, without turning off the entire home.

not a fixya site problem
contact rona direct for parts

Perhaps it is taking a long time to fill the cistern, take top off and see if it's filling after flushing, if it's slow and pressure is ok it is likely to need a new diaphragm in the filling valve.

buy a simpler toilet less problems and you will sleep at night

Hi!please kindly check your fill valve if it is working correctly.I thought the problem is in your fill valve.Kindly adjust the floater of your fill valve.

The ball float follows the tank water level, and repeated cycles of the float dropping and opening the fill valve would likely reflect a leak in the flush valve. You could try adjusting the float arm downward so that it will respond to a lower water level. Try turning off the supply valve, flushing it and listen for water leaking past the flush valve after it closes. If it does, replace the flapper or adjust the chain.

Remove the tank lid and look at the fill valve. Is it a yellow valve?
This fill valve is common on the Toto Toilets and can easliy plug with debrie.

They can be disassmbled and cleaned. however, I usually just replace the valve with Fluid Master Fill valve.
You will also want to check the water coming into the toilet by turning off the water that supplies the toilet and disconnecting the water supply line. After removing the water supply line turn on the water at the valve to make sure that the water is flowing properly. Check the supply line also to make sure it is not plugged.
Be sure and place a small container to catch the water that will come from the valve. A towell will also help from making too much of a mess.
If the Supply line and the valve are clear the problem is in the fill valve.
The G-Max system denotes the Flushiing system which is a 3" flapper that allows the water from the tank to flow into the bowl quicker.
Good Toilets!

sanray