20 Most Recent Toto Neorest 600 1pc. Toilet MS99OCGR-01 Questions & Answers

You may be experiencing a valve issue. Of course, it could be any problem. It's really hard to tell with toilets. I would check the water level first and add water into the tank if it looks like it doesn't satisfy it's system. My toilet gives me a lot of trouble and I am constantly calling for plumbing services. However, a lot of times when I'm having issues I'm able to fix it momentarily by adding water or pulling the chain link my self. http://absolutelyclearsewersandplumbing.net/Services

Replace the inlet water valve within the tank and that should take care of it.

Sounds like the washer in the shutoff at the wall has failed and is partially blocking the fill pipe. Some rubber from it may have gotten into the toilet valve internally. With the wall valve closed, try to remove the connection pipe to the toilet. If you can do it without water continuing to flow out of the wall shut off...then remove the pipe from the wall shut off. Flush the toilet. Now, apply air pressure to the rubber hose the goes into the overflow pipe. That may clear the valve in the tank and solve both problems. If you cannot stop the water at the wall shut off, close the water valve feeding the house. Remove static water pressure by opening the cold water a the kitchen sink faucet. Now you can open the wall shutoff valve and replace the washer and clean it out....

You may have another malfunction here. Get your manual and see what it says under troubleshooting.

Yes. Remove the batteries and wait 1 or 2 min reinstall the batteries it should be reset.
If the same thing happens again you have a mechanical problem in the lifting and lowering mechanism.

Put it within reach of the unit and make double sure it is GFCI protected!!!!!!

check the over flow valve shutoff and make sure it is at the right height

The Owners Manual for the MS990CGR and be found on line at Totousa.com. I have provided you a direct link below for the Pdf file.

http://admin.totousa.com/Product%20Downloads/D06786,%20NEOREST%20600%20COMFORT%20FUNCTIONS,%20EN,%20OM,%20V.01.pdf

Have you tried resetting or resetting it to factory settings? If this does not work, I would recommend getting in contact with the company to discuss your problem. There customer service team is here to help you if your product is not working correctly.