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We've had this issue with several Toto washlets ourselves. Every one of them was due to a electronics issue. It's important if you are under warranty to can't act TOTO first before doing anything else.
You have the option of trying to fix it (parts are not cheap) if we can narrow down the problem or replace it. We ended up selling mor BIOBIDET brand units. They are far less expensive and have lasted longer.
The hard part is determining what's wrong. If it isn't electronic.
I'm headed into a meeting for most the morning if you want to move forward with troubleshooting I can help you after that
As I expected. Good luck with it. Their customer service has been seller. If you're satisfied with my help today I'd appreciate a positive rating. Thank you so much for using just answer
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Everything turn out ok?