Modern toilet cisterns without overflowprovision

With lid removed, look down into it and remove and replace the black rubber thing in the center. This is the flush valve and is worn to the point where is no longer provides a tight seal allowing water to pass and run into bowl. Also, could be something underneath it not allowing it to seat properly.

Fixing a leaky toilet is actually rather simple, requiring few tools and just a little time and effort. In looking at Caroma toilets on Google, they appear to be just a standard type of unit, and should present few if any problems for yourself or any handyman of modest skill.

If it is leaking around the base of the toilet - where the toilet sits on the floor, the repair item is a simple wax seal. Here is a tutorial to effect this repair: Replace Toilet Wax Ring. The wax ring is very inexpensive, usually $5 to $10 USD.

If the water is leaking from between the tank (cistern) and the toilet bowl, the job is even easier, as it does not require lifting and moving the entire toilet. A good tutorial for that repair is here: How to Replace Tank to Bowl Gasket . The gaskets, new nuts, bolts and rubber seals come in a kit and also cost only $5 to $10 USD.

I am sorry to hear your Plumber insisted you buy an entire new toilet, but do remember he is in the business of making money!

can only be one of 2 things. the inlet valve is not shutting off properly and so the tank is overflowing into the toilet bowl or the flush valve rubber is worn out. you can find this at the bottom of the flush valve mechanisum.

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.

I don't know if it is illegal or not but it is down right wrong. I would not tear out a toilet on a friday and leave somebody without one. It would be like tearing the roof off and going home for the weekend. You don't do it. I would go out in the yard, get the old toilet back in there and hook it back up. then back charge him for your time and labor. Then tell him the building inspector came by and took all his info. He said he'd be in touch.

Sounds like the float is hanging up or needs to be adjusted. This is usualy a simple little tweak, depending on the valve. I hope this helps.

there is an adjustment screw ontop of the fill valve assembly. Tighten this down and the water level should stop at a lower level unless the internal mechanism has crusted up.

most modern toilets do not have an overflow pipe to outside instead they overflow into the bowl itself so have to adjust level so it does not overflow into return

check that the water in the cistern is up to the mark etched on the inside
Do you have a close couple or a washdown [with pipe from cistern to pan]

On this model am not sure if it come apart. But if you have a air compressure try and blow though it. when you have it off toilet. sounds like its dirt caught in it.
hope this helped. :)