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Thread: Rheem Gas Pool Heater Making Knocking Sound

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    Rheem Gas Pool Heater Making Knocking Sound

    My Rheem gas pool heater is making a knocking sound on the inside. It is not giving an error messages and the heater is working. What could be the problem?

    Thanks for your help!
    East TN
    13,000 gal San Juan Fiberglass Pool;SWG; GoldLine Pro Logic Controls
    Hayward Sand Filter; Hayward Max-Flo XL Pump;Polaris 380; Hayward ColorLogic LED
    Raypak Gas Heater

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    Join Date
    Oct 2010
    Location
    Georgia
    Posts
    317

    Re: Rheem Gas Pool Heater Making Knocking Sound

    The knocking sound you hear is the water boiling inside the heater. It is generally caused by a lack of water flow through the heater.

    Clean your pool filter, empty the skimmer basket(s), clean the pump basket, and anything else that might restrict the flow of water though your system.
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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    In the Industry

    Join Date
    Mar 2011
    Posts
    441

    Re: Rheem Gas Pool Heater Making Knocking Sound

    After doing the above, I'd look into replacing the unitherm gov
    20X40 30,000 gallon gunite pool

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    Melt In The Sun's Avatar
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    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: Rheem Gas Pool Heater Making Knocking Sound

    Check out this thread:
    heater-clanking-sound-t29212.html
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: Rheem Gas Pool Heater Making Knocking Sound

    Thank you for your help!! I have turned off the heater and have called the service technician. I think it is still under warranty. I hope so!!
    East TN
    13,000 gal San Juan Fiberglass Pool;SWG; GoldLine Pro Logic Controls
    Hayward Sand Filter; Hayward Max-Flo XL Pump;Polaris 380; Hayward ColorLogic LED
    Raypak Gas Heater

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    Re: Rheem Gas Pool Heater Making Knocking Sound

    My husband called the Rheem dealer and they said we probably had a broken bypass spring. Is it difficult to replace a bypass spring? What would cause the spring to break? The heater is less than 2 years old.

    Thanks!!
    East TN
    13,000 gal San Juan Fiberglass Pool;SWG; GoldLine Pro Logic Controls
    Hayward Sand Filter; Hayward Max-Flo XL Pump;Polaris 380; Hayward ColorLogic LED
    Raypak Gas Heater

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    Join Date
    Jul 2010
    Location
    Pt. Arthur, TX
    Posts
    174

    Re: Rheem Gas Pool Heater Making Knocking Sound

    My Hayward heater has a bypass cartridge. It is a single unit that you replace as one piece. It is easy enough to get out, If I thought the spring needed to be replaced, it wouldn't be hard to do.

    I don't know how different your rheem is.
    Custom Cloud shaped 19'x35' - Raised Spa 6' diameter
    Rainbow 320 Inline Chlorinator - Paramount Clear O3 Ozone Generator
    Hayward C4025 Cartridge Filter (Hayward CX880XRE) - Hayward Tristar 2 speed pump
    Hayward H400Fdn Heater, Hayward GVA-24 (valve actuators)

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