The drain from the toilet to the main or the main itself is partially clogged or collapsed. There is probably enough room for the sink to drain but the washer puts out so much water all at once it can't get through and backs up into the tub and toilet.
When you pull the handle a washer is lifted and the water goes down into the toilet and at the same time the cistern fills up once the washer is back in place from the flushing mechanism
The sewer line is plugged or collasped. The sink and bathtub may drain because they drain at a slower rate. Toilet is all at once and the drain can't handle it. Water has to go somewhere so it backs up in the sink and tub.
It fills the washer with water from the source, Theres usually a cut-of valve or faucet on the wall near the washer for it.
Find a toilet and go pee.
before.
If a Maytag washer fills with water but does not agitate it could a problem with the switch in the lid. There is a switch that locks the lid down during agitation and spinning. The magnet could be defective.
Usually not. If toilet has a mixing valve going to it so warm water fills toilet tank and toilet runs constantly, then enough warm water could leak out through toilet to possibly have an effect on water heater.
Is the toilet on the second flore? Do you have a dog?
remove and install a new filler valve and get a proper flapper for your toilet at a plumbing supply
Time to change the rubber flapper in the tank
Nothing, it should all come with the dishwasher. It fills from the faucet.