Shut the water off, at the toilet if possible, take the line loose that goes to the tank and see if it is the supply line or the filler valve. I'll bet it's the valve. If you have the type that has a round float that rides up and down on a post, they have a washer in the top with a small hole in it that lets the water in. Rust and corroisen can break off when you shut the water off and it will plug this hole. Hold the shaft so that it doesn't break and twist the top 1/8 turn counter clockwise. The washer is in the top of the stack, black about the size of a quarter. Take the washer out and turn the water on slightly to push out any particles that might block the hole in the center of the washer. Reassemble and I bet it works.
because the upstairs toilet drain was clogged up.
Air in the water lines to the upstairs. Not enough water pressure.
Unless it is a very strange arrangement, turning off the toilet on the first floor should only shut off the water to that toilet. It should have no effect on the upstairs shower.
Same as a regular toilet.
First check to see if the valve for the water supply is turned on. If that isn't the problem you may need to replace the tank water valve, they do wear out and are not that expensive or difficult to replace.
Someone hooked up the hot water supply to the toilet instead of the cold water supply- or your water heater is back drawing hot water through to the toilet from a cold water inlet (supply)
Shut the water supply off to the toilet. Flush the toilet. Pull the old flapper out and replace it with the same type. Turn the water back on and test the toilet.
It is quite possible that your main pipe to the city sewer system has become blocked somewhere between the basement floor drain and the man city sewer line. Could be a result of items flushed down the toilet(s), or damaged pipes as a result of age, tree roots searching for water, etc. Suggest having your main access to the city sewer system checked by camera.
1.5 Inch
the most likely answer to this question is a faulty washer, the reason it keeps running until the washing machine is turned on is cause the pressure is being withdrawn from the toilet. replace the washers to the toilets and monitor. if this fails you may have to consider replacing all the mechinisims inside
Sound like you have a clogged toilet and or a clog in your main drain under your toilet. Shut off water supply to toilet remove water from toilet tank. Puchase a wax ring for your toilet prior to disconnecting toilet from supply line and floor bolt on the right and left of your toilet. Remove toilet from floor if water is standing in pipe under where toilet was this is where your problem lies. If no water or clog present, turn toilet on side and lokk in hole at the bottomof toilet. Clear was is stuck in toilet clean off old wax ring install new one and put toilet back together.
Make sure your main water is turned on by turning on another sink or bath and if it is then turn your toilet valve off and on a couple times and see if any water comes out in your tank. If still no water is filling the tank then shut off the valve and take the supply tube off the valve and turn the valve on slowly to see if you have any water comming out. If still no water then your valve is plugged or your pipe to the valve is plugged which then you would need to clean out your valve or lines with the whole house water shut off. Sometimes I have seen that the plug is in between the valve an supply pipe connection and as soon i take the supply pipe off and turn on the valve it works just fine even when I put the supply pipe back to the toilet. I don't think it would be in your fill valve in your toilet tank unless you have pressure assist tanks and with them all you need to do is take out the screen inside them.