Question about Saniflo Sanibest macerator with multiple connections

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I have been called out to look at a Sanibest system which stays on all the time. My guess is probably float switch related. Are there any service/maintenace instructions other than the user instructions available from the Saniflo website? Alternatively could it be anything else other than the float switch?

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I had the same issue before. Definitely has to do with the float switch. Could be that a piece of solid is stuck at the bottom of the float switch or the membrane (black rubber piece at bottom of flat switch) may be warped/deteriorated and will need to be replaced.

Posted on Jul 20, 2010


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Saniflo is working its only connected to a sink but only pumps three quaters of the water away then stops and leaves rest of water in the sink

Sounds like the pump needs to be de-watered completely and cleaned. There is a pressure chamber that contains, I am guessing here since I hve never taken one apart, a float and a microswitch. If the float gets heavy with gunk or gets a hole in it, it will not float as well and will take more water in the drain pipe to cause it to rise up and activate the micro switch. I don't know how hard it is to disassemble these units but hope it is fairly simple since they are pricey. You said it was only on a sink, not a toilet or both. It is possible that grease has built up (the gunk) and a hot water flush may do the job for you but it will take a lot of hot water flowing through the grinder, that of some grease dissolving drain cleaner.

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The unit is several years old - the float keeps falling in and the unit shows full -can I get a new float and will that fix the problem?

If the float falling in tells you its full probably not. Unless the float floats off a switch. Then a new float that wont fall off would probably do it.

If the float keeps falling off...why not tie a small piece of fishing line to it and suspend it above the switch? It will stay where its needed until water lifts it up.

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1 Answer


The float is most likely stuck or the switch is bad. The switch and float are usually in the plastic surge tank. Usually that tank comes off fairly easy, you could try taking it off and shake it that might jar the float lose.
But, if it sticking I guess I wouldn't rely on it, check the coolant level periodically.

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Take the lid off the cistern tank and have a look. There is a ( usually ) round float ball in there. This is what is causing it. When the cistern fills up the ball is supposed to float up and the arm it attaches to shuts off the water, usually at the opposite end to the float.
Turn the tap on the pipe to the cistern so it is nearly off and move the arm up and down by hand. See what it is getting stuck on or what is happening.

If it is not a simple sticking problem, you may need to undo the top of the cistern valve itself ( opposite end to the ball. )
Turn the water off completely to the cistern to do this or you will get squirted. :)
They are fiddly little valves and all a bit different but if you take your time and make sure you have a good light you will be able to work out what has been happening.
Hope this is some help.

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Empty water light staying on machine will not work

Probably sticking float switch
Remove lower bottom left filter completely run water thro it to clean all fluff out reach inside and clear any build up of fluff that you can see or feel.
At the back of this aperture is a small hole that gets clogged up,feel for it and poke a plastic bag tie or similar, and poke it clear, if this does not work then it would probably involve a strip down to access the float chamber and switch assy.

Plz rate my solution.

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