https://house.ettoday.net/news/1422628
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無論哪一種類型的電熱水器，都要保持隨手切掉電源的習慣。平常也可自行檢查電熱水器有無異常，電器若正常使用狀態下，自動斷電開關顯示為「ON」，按下測試按鈕後電器會自動斷電顯示「OFF」，如無立即斷電反應時，就該通知房東請專業人員檢查維修。
References
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