Prepare to get dirty. Use a mug with a handle to lift the water out of the toilet bowl into a bucket. Reduce the water level until it stops increasing from the backflow from the Saniflo. Disconnect the electrical connections (isolate the unit first) Disconnect the outflow pipe but be prepared for some spillage from any vertical pipe in your domestic installation. Ease the boot off the WC soil pipe, Disconnect any breathers. Slide the unit out from behind the toilet but maintaining a backward tipping angle to prevent water inside the unit from spilling out of the boot. Take the whole unit outside, keeping it tipped backwards. Take the lid off, noting how the seal is oriented for reassembly. Use a high pressure garden hose to clean out the interior and inspect. Check the rubber diaphragm on the bottom of the sensor unit. These develop corrugations and become slack over time. If so it will have insufficient power to depress and release the microswitch within the sensor unit. If your unit filled the toilet bowl with soiled water and the pump kept running, it is likely that the non-return valve beneath the outlet pipe is faulty. On some models the valve is Y shaped and the branch of the Y is a rolling ball that falls by gravity when the pump switches off. Replace the valve. If your unit kept running but with clean water in the bowl, it is likely your diaphragm is faulty. Check for corrugations and make sure it is no longer caked with accumulated solid waste. If you cannot buy a new sensor unit complete with diaphragm, you may need a new Saniflo. Both of my Saniflo units stopped working satisfactorily after 10 years. My German built unit has now been working without fault for 19 years.
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Prepare to get dirty. Use a mug with a handle to lift the water out of the toilet bowl into a bucket. Reduce the water level until it stops increasing from the backflow from the Saniflo. Disconnect the electrical connections (isolate the unit first) Disconnect the outflow pipe but be prepared for some spillage from any vertical pipe in your domestic installation. Ease the boot off the WC soil pipe, Disconnect any breathers. Slide the unit out from behind the toilet but maintaining a backward tipping angle to prevent water inside the unit from spilling out of the boot. Take the whole unit outside, keeping it tipped backwards. Take the lid off, noting how the seal is oriented for reassembly. Use a high pressure garden hose to clean out the interior and inspect. Check the rubber diaphragm on the bottom of the sensor unit. These develop corrugations and become slack over time. If so it will have insufficient power to depress and release the microswitch within the sensor unit. If your unit filled the toilet bowl with soiled water and the pump kept running, it is likely that the non-return valve beneath the outlet pipe is faulty. On some models the valve is Y shaped and the branch of the Y is a rolling ball that falls by gravity when the pump switches off. Replace the valve. If your unit kept running but with clean water in the bowl, it is likely your diaphragm is faulty. Check for corrugations and make sure it is no longer caked with accumulated solid waste. If you cannot buy a new sensor unit complete with diaphragm, you may need a new Saniflo. Both of my Saniflo units stopped working satisfactorily after 10 years. My German built unit has now been working without fault for 19 years.