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Thread: Jandy LT has loud vibrations when exhaust fan turns on

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    Jandy LT has loud vibrations when exhaust fan turns on

    Hello everyone. I have a Jandy LT heater on my pool. I recently replaced an ignitor and flame sensor, which fixed one problem thanks to this website.

    This was the first time I had turned the heater on in a few months. Once it came on and the gas ignited, I noticed a loud vibration when the exhaust fan was engaged.

    I suspect it is simply the fan bearings are beginning to go, but could there be another cause? I read something online about a switch of sorts causing similar problems so thought I would check with the experts. The vibrations occur only when the fan is going.

    Thanks in advance.

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    TFP Guide

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    Re: Jandy LT has loud vibrations when exhaust fan turns on

    I would pull the inducer fan housing off and check the fan blades. Most likely there is one or two missing .
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Jandy LT has loud vibrations when exhaust fan turns on

    Im not familiar with that heater, but as far as I know, standard sequence of operations for gas heaters/furnaces is inducer(exhaust) fan should be running before gas is lit. Are you sure the fan is kicking on after ignition or is it possible the vibration you're hearing is the burners firing or possibly something else loose in there?

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    Re: Jandy LT has loud vibrations when exhaust fan turns on

    Quote Originally Posted by stebs View Post
    Im not familiar with that heater, but as far as I know, standard sequence of operations for gas heaters/furnaces is inducer(exhaust) fan should be running before gas is lit. Are you sure the fan is kicking on after ignition or is it possible the vibration you're hearing is the burners firing or possibly something else loose in there?
    Thanks for your response. You are correct. The actual sequence is the fan comes on to empty any stray gas that may be in the unit. Then the fan shuts down (or slows way down) and the gas ignites. Then once the ignition is on for a few seconds the fan again "comes on". Whenever the fan is running there is the vibration.

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    Re: Jandy LT has loud vibrations when exhaust fan turns on

    Quote Originally Posted by danpik View Post
    I would pull the inducer fan housing off and check the fan blades. Most likely there is one or two missing .
    Thanks for the information. I will do this.

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