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Thread: Sta-Rite SR400NA "gravely" noise and fault

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    Sta-Rite SR400NA "gravely" noise and fault

    Hi folks, My heater goes through the normal startup process to the point where it starts blowing hot air. Then it makes sounds like gravel is bouncing around inside and it shuts down and throws the "Service Heater" light. I'm not an expert, but does this sound like a problem with the valve system that opens and lets water flow through the heater? Thanks for all attempts to "give a haircut over the phone". All thoughts are appreciated. Video of startup and sound: https://youtu.be/-6MIm9jbQy0

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    Mod Squad pooldv's Avatar
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    Re: Sta-Rite SR400NA "gravely" noise and fault

    Welcome to TFP!

    Generally, gravelly noise in plumbing indicates cavitation, which is insufficient water flow, which supports your theory that the valves to the heater are not set correctly an restrictions flow.
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    Re: Sta-Rite SR400NA "gravely" noise and fault

    Thanks, pooldv. Any thoughts about the video? You can skip to 1:49 to hear the noise.
    40k gallon in-ground. 3 pumps. Natural Gas heat.

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    Re: Sta-Rite SR400NA "gravely" noise and fault

    Video not showing up.

    I suspect that the noise is due to low water flow. The water is probably boiling.
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    Re: Sta-Rite SR400NA "gravely" noise and fault

    If water flow is good, then you could have a broken bypass in the unit and or bad thermal regulator.
    Paul
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