Try using a force-cup plunger (the bigger the better) and pump forcefully 15-20x. The plunger cup should be fully submerged, so if there’s too little water add more in and if there’s too much water then you should dump some out.
If that doesn’t work, try using a closet auger
Is your toilet suffering from “phantom flushes?” That’s when the tank starts periodically refilling itself although no one has flushed. If so,
Your flapper or flapper seat might be damaged. Try draining the tank and bowl, cleaning the flapper seat, or replacing it if it’s damaged. This Youtube video explains how to do it pretty clearly.
You can always call us if you get stuck and we can walk you through how to fix this.
Does your toilet flush too slowly? If so,
The water flow may be weak because of clogged holes underneath the bowl’s rim. Use a curved wire to poke the flush holes and clean out debris. The wire from a coat-hanger should do the job!
Is your toilet constantly running? If so,
it's likely due to the chain being disconnected; if possible, attempt to reconnect it
You can always call us if you get stuck and we can walk you through how to fix this.
The fill vale (float) inside the tank may need adjustment, this can typically be done by hand turning the adjustment knob until the float stops the water from overflowing into the open pipe inside the tank.
If the toilet is overflowing, turn off the water supply immediately. Each sink and toilet should have one or two individual shut-offs at the wall. Turn the valve (pictured below) clockwise until it stops turning to cut off the water flow.