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Thread: hayward heater throwing AC diagnostic code

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    hayward heater throwing AC diagnostic code

    When I attempt to fire up the Hayward propane heater it throws the AC diagnostic code after waiting 30-40 seconds.
    I do not hear the fan start up and there's no attempt to to ignite. Its just silent.
    I've power cycled and looked for obvious obstructions to no avail.
    The heater had been working fine up until this happened a week ago. Any ideas?
    22650 gallon in-ground vinyl pool
    Hayward sand filter
    Aqua Rite SWG
    installed 6/25/09

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    ps0303's Avatar
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    Re: hayward heater throwing AC diagnostic code

    Which Hayward heater do you have?
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: hayward heater throwing AC diagnostic code

    I believe its the Hayward H250FD. Sorry for the late response as my daughter was hospitalized for a while.
    I have replaced the display module since that helped in the past but did not help this time. I have found
    that by power cycling the heater, disconnecting and reattaching the tube connecting the blower
    and the blower vacuum switch, along with some random reconnecting various connections the heater will
    sometimes fire. But subsequent attempts to restart the heater throw the AC code again. When shutting
    off the heater another error code (sorry can't remember what it is) is thrown temporarily but eventually clears itself.
    22650 gallon in-ground vinyl pool
    Hayward sand filter
    Aqua Rite SWG
    installed 6/25/09

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    Elizabeth
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    Re: hayward heater throwing AC diagnostic code

    When the heater goes through the routine to fire, one of the things it does is to check the vacuum switch to make sure it is open Why, the vacuum switch is closed by the fan proving it works so if it is shown closed the code will appear. If the switch is closed there are two possibilities. One is a bad vacuum switch, or a bad main module. Here is the link for the manual.

    http://www.hayward-pool.com/pdf/manu...stallation.pdf
    Hayward Pool Tech
    80+ Years of Technologically Advanced Pool Product Manufacturing
    poolside@haywardnet.com

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    Re: hayward heater throwing AC diagnostic code

    The diagnostic code is HF when I turn off the heater if that is informative. It eventually clears itself but that is the code I referenced above when turning off the heater.
    22650 gallon in-ground vinyl pool
    Hayward sand filter
    Aqua Rite SWG
    installed 6/25/09

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