Toilet stools whistle after flushing

That's probably because it doesn't know the words. Just kidding.
Whistling sounds usually indicate some type of restriction in the water supply. It may be the stop valve is not open all the way. Dirt or scale in the fill valve or lime buildup can also cause a whistling noise. check for these issues. and clean or replace parts as necessary.
Hope this helps.
Bob

It could be a blocked vent.when the downstairs toilet flushes it draws air down the drain with the wastewater. The vent is suppose to supply air to make up for this. If the vent is blocked or there is no vent. Air is drawn from the easiest place ,in this case through the upstairs toilet,drawing the water out of the toilet trap with it. In northern climates the vents sometimes frost shut causing the problem you describe. Hope this helps.

What is happening is that water is seeping out of the toilet quietly until the level drops low enough in the tank thus causing it to refill on its own. Solution replace the flapper.

The seal at the bottom of the tank is leaking. Usually the call this a flapper. Take the top off the tank and look directly to the bottom of the tank in the center. Flush the stool and you will see the flapper rise and then fall. You probably need to replace the flapper. To do this just turn the water off to the stool, flush it to get all the water out of the tank, reach your hand in the tank and disconnect the flapper and now you can take it to most hardware stores and get another one.

There is dirt in the fill valve....the water squirting by makes the noise...

heatman101

it does this get used to it.

There is a shut off valve under the stool. turn the water off and go to walmart and get a new valve. Take the one out of your stool so you get the right one. hope i was helpful

for the upstairs if the valve is fully on there is not much you can do other than replace water service to the house or heaven forbid repipe.Valves usually don't restrict fill volume.But you can take the supply loose from the tank and stick it in a bucket turn the valve on and check the flow.this should narrow it down.Down stairs repair or replace flush valve

After working for ROTO-ROOTER for 20 + years, I have come across this problem more than twice. There are many problems that can be included, but let's start with the most simple and go from there. Step 1... Check your roof vent to see if it is obstructed with debris, such as birds nest, frozen ice, dead animal...etc..... To check this you must go onto the roof and find the sewer vent(it is not hard to find as it smells like sewer). Visually look into the vent even using a flashlight to make sure there is nothing obstructing the vent pipe. certain things can clog your vent such as Debris,Birbs Nest, Ice, dead animal,Etc..A drain line needs a air vent so water can flow....If nothing is visually seen , have someone flush the stool. If you cannot see any obstructions and HEAR THE FLUSH, Your Vent is okay. Check out plumbing and venting on the internet for more reference. If this is not your problem then you must pull the stool and see if there is an object stuck in the toilet......Comb, toothbrush, Etc... The best way is to pull the stool from the floor and look from the bottom of the toilet to see if there is an object stuck inside the stool.Turn off the water supply and disconnect it from the tank. Go to your local hardware store and buy 2 wax rings with plastic flanges and a set of flange bolts(these are cheap and can be returned if not used).Turn off the water supply to the toilet tank and flush it to drain all the water from the tank and the stool. You can use a shop vac or an old towel to remove the water. After removing the stool, lay it on its side and look from the bottom to see if there are any obstructions. You may need a mirror and flashlight to see inside the gooseneck of the stool. If you cannot see any obstructions, you can try to dump a 5 gallon bucket of water through the bottom of the stool to push the object out the way it entered. NOTE: When reinstalli8ng the stool, be careful not to over-tighten the floor flange bolts as you might crack the toilet......Joe

The tank holding the proper amount of water is a good sign. The inside of the stool is like the GOOSE NECK under you sink. It always holds water. This may sound like a bit of a hassle to do but if all 3 toilets are identical, here is what you can try if you are a bit handy. Go to the hardware store and purchase 4 toilet wax rings with a plastic flange and a few sets of toilet floor flange bolts(they are cheap and you can always return if not used, as It is better to have xtra parts on hand). Turn off the water supply to the "Mystery Toilet". Leave the tank and everything connected to the stool. Flush the toilet and remove all excess water from the tank and bowl. This can be done with a shop vac, sponge or towel. Disconnect the water supply to the tank. Remove the bolts holding the stool to the floor and carefully remove toilet. Scrap off all the old wax from the floor flange and bottom of stool. Now go and repeat this proceedure to one of the toilets that is working properly. In other words Switch the "Mystery Toilet" with a "Working Toilet" and see how they react. If the working toilet does it in the same bathroom and the "Mystery Toilet" does not do it in the other bathroom then you probably have a VENTING PROBLEM. If the "Mysery Toilet" Does it in the other bathroom then you most likely have a Defective Toilet. This Job is best done by 2 people, as it can sometimes be challenging to center the new wax ring on the toilet flange. Reconnect to the floor and reconnect water supply to the tanks. DO NOT OVERTIGHTEN BOLTS to the floor flange as you may crack the toilet. All drain lines must be vented properly for water to flow. If you are curious check out drain venting on the internet. Also, sometimes a vent can become obstructed with debris, ice, bird nest, etc.. I would 1st check the vent on the roof visually and then have someone flush and listen. If you believe the vent is clear....Then do the toilet switch and go from there.....Hope this helps and Happy Holidays....Joe