TOTO toilets are exceptionally reliable, but common mechanical issues can include a running tank caused by mineral sediment lodged beneath the flapper, slack in the trip lever chain, or wear on fill valve seals over extended years of use. For electronic smart washlet models, occasional issues can involve spray wand calibration errors or temporary sensor glitches if low battery voltage occurs or if hard water calcium scale accumulates around the bidet nozzle jets over time.
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