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Could be an obstruction in the blade, impeller or the discharge line. Also the starting capacitor may have gone bad and is not keeping up with the head pressure, it may need to be replaced. But i would suggest inspectin the unit first for any obstructions.
Is your Saniplus humming or motor spinning slow or not at all?
It is likely the internal motor control capacitor - It is the most common replacement part for these units and a fairly simple DIY although you will need rubber gloves and bleach.
I have posted repair instructions for the Saniplus here:
If your Saniplus macerator won't pump and the motor is humming or spinning slowly it is 95% likely that the internal motor capacitor has failed - most common problem with these units
Definitely there is an obstruction on the blade or impeller inside the pump casing. Pry open the lid using a flat head screwdriver and remove the motor with pressure chamber out of the pump csing as one piece. Once the motor is out inspect the blade (on top of motor) and the impeller which is at the bottom of the motor. Also the starting capacitor may have seized up. If the capacitor goes bad it tend to hum and not pump any waste out.
There can be a blockage somewhere in the discharge pipe, the blade or impeller. Also the short discharge pipe or long elbow inside the pump casing may be split open or not attached properly and waste water is just cycling inside the pump casing. Worst case scenario could be a bad capacitor, the capacitor spins the blade and impeller, it that goes bad the unit will just hum and not pump any waste out until is replaced. You can also order parts through Saniflo if needed.
If the pump is humming and backing up then there is a blockage on the drain pipe, blades or the impeller. Also the capacitor may have gone bad and it will need to be replaced. The capacitor drives the blade and impeller, if it goes bad then it would just hum and not pump out the waste.
Typically the pump will hum is something is stuck on the blade, impeller or if there is a clog on the drain pipe that is not allowing the waste to be pumped out. The capacitor/condenser drives the blade and impeller, if the capacitor has gone bad it will make the unit hum and not pump the waste out. If there are no obstructions then most likely the capacitor will need to be replaced.
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