If your toilet does not flush it is pretty useless to you. There are many reasons why a toilet won’t take the water away; you just have to figure out why it is not working.
1. If the water in the bowl will not go down at all, there is usually an obstruction in the trap of the toilet. This could be anything from too much waste or paper to something like a small brush. If you can not remove the obstruction by plunging, a toilet auger (snake) will usually dislodge it. If the auger does not help, the toilet may have to be replaced.
2. The drain line for the toilet may not be vented properly. This condition will not allow air into the drain for a proper flush. If this is the case you will need a plumber to correct the problem.
3. On some styles of toilets there is a small hole at the bottom of the bowl near where the water discharges. This is the siphon jet. When flushed water is sent through this hole to pull the water in the bowl down. This hole can become clogged with debris or build up, if this happens the bowl will not empty. Put rubber gloves on and try to remove the block with a wire hanger or something similar.
4. The main drain for the home could be clogged after where the toilet is connected. This situation causes the same problem as when the drain is not vented properly. You will have to have the drain cleared.
5. Check the toilet tank to see if operation is good. Make sure the tube that fills the bowl through the fill tube is connected. See if the water is emptying from the tank into the bowl. When there is a problem in the tank it will affect how well the bowl empties.
6. One condition that I have found is that the toilet is just no good. The quality and design of a toilet does matter in its function. If someone pays $35 for a toilet that is what they will get, a cheap model. Spend good money on a quality toilet for years of reliable flushing.
There are many times customers will tell me that they noticed the toilet not working properly days, sometimes weeks, before calling me. But by not looking into it, the problem became an emergency. The key is to act as soon as you notice a problem. You may not be able to take care of the problem, but by identifying it you are on your way to a better flush.