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  1. #1
    Join Date
    May 2011
    Location
    NYC
    Posts
    23

    Problems with hot water heater

    It's an AO smith model # HW670-200
    it keeps cycling, it turns on for like 10 sec then it shuts off then back on. my guess was the hi limit but it metered ok any ideas? or maybe flame sensor?

  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,488
    Bad thermostat


    Sent from my iPhone using Tapatalk

  3. #3
    Join Date
    Sep 2014
    Posts
    8
    Yup, It's definitely a bad thermostat. Easy to replace.

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