When I flush my mascerating toilet, the tank behind the toilet floods over. How do I fix this?

If the leak is inside the toilet, then you have a defective flush valve or flapper Which ever one is in your model toilet.

InLet valve diaphtagm need replacing

Turn off the water at the supply (under the toilet, usually).Flush the tank to remove all water from the tank.Disconnect the supply from the tank.Remove bolt caps or bolt covers from where the toilet bolts to the bathroom floor.Remove bolts from the floor flange. When you lift the toilet up, you'll see a metal or plastic flange. If the toilet has been there for a long time the bolts may not pull out of the flange easily. In this case you may have to use a small hacksaw to cut the bolt below the nut.Put newspaper or an old towel on the floor so you can place the old toilet on it. Lift the toilet off the flange.Take the new bowl (assuming this is a two-piece toilet) and turn it upside down. Position the wax ring on the horn of the outlet. Install new solid brass flange bolts, mount them and position them on the centerline on either side of the outlet.Push the bowl down over the bolts and seal the outlet. The wax will squeeze down and seal.Put the new bolts, washers and bolt caps on. You may have to trim the bolt with a hacksaw.Once the bolts are secure, mount the tank.Make sure the gasket between the tank and toilet is in place. Then position the tank on the bowl. Run bolts through the tank and secure. Don't over tighten (the tank can crack).Hook up the water supply line.Connect the supply to the line on the bottom of the tank.Turn on the water.Let the tank fill.Flush once or twice to make sure the water control is properly adjusted.Put the tank lid on.Enjoy.
ford performance chip.

you have a blockage in drain system. also make sure the air vent is ok.

This seems like a problem with your cistern and not your macerator - I have a similar set up and if your push button is stuck you need to check the mechanism in the cistern - also you should have an overflow that drains into your loo within the cistern so you should check this for blockages as well.

One thing to check is the check valve may be leaking back, float may be faulty, toilet maye be leaking and filling tank causing pump to come on.

Check out this link with a trouble shooting guide for this unit.

This first kink has information on different types of Santiflo systems.

http://www.saniflo.com/Downloads.aspx

This next link has a trouble shooting guide that covers these issues.
http://www.saniflo.com/pdf/install/PLUS_US.pdf

Alot of times this problem occurs when there is not enough water in the tank behind the seat and bowl. Lift off the tank lid and see how much water is it, It should be near full.If it is not your problem is not enough water.

there is no air release. the vent must be clogged somewhere. you can take a hose up there and see if it drains all the way or floods over. since the tub drain has a trap and the toilet itself is a trap, there has to bee a good amount of air pressure coming up without a release. i would say an obstruction. possibly at the junction of the main and the vent.

Your ball **** needs replacement (water control valve), Also your flapper or tilt valve disk is leaking water through it and it needs replacement also.

I fixed the problem. There was a clog in the pipes so i just flushe dthe pipes out.
thanks,
for your help