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Thread: Hayward H250FDP Heater intermittent problem

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    Hayward H250FDP Heater intermittent problem

    I have a two year old Hayward H250FDP heater for my spa that has recently developed a minor problem (for now anyway).
    After draining and refilling the spa, the heater will light and stay lit for about 60 seconds. It then stops heating for about 30 seconds before it relights.
    It goes through this cycle about a half dozen times before it stays lit until it reaches the desired temperature.

    Does this sound like the flame sensor is getting ready to go kaput?

    Or something else?

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    Re: Hayward H250FDP Heater intermittent problem

    At this point until it completely fails you are only guessing as to what the issue is. No water flow issues?
    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 H250FDP Heater intermittent problem

    Do you have any codes on the heater during this time. The heater tries to light three times before a failure code is shown on the screen. This could be low gas, low flow, etc.
    Hayward Pool Tech
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    Re: Hayward H250FDP Heater intermittent problem

    Quote Originally Posted by Hayward Pool View Post
    Do you have any codes on the heater during this time. The heater tries to light three times before a failure code is shown on the screen. This could be low gas, low flow, etc.
    There are no codes on the heater. The heater lights without any problems. It just shuts off after about a minute or so. Thirty seconds later the heater lights again.
    It goes thru this cycle about a half dozen times before the heater stays on until it reaches the desired temp.

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    Re: Hayward H250FDP Heater intermittent problem

    What size is the propane tank? How much propane is in it now? Have there been any changes to the propane system? Try watching the temperature reading on the heater as it heats.

    Are you sure that there is adequate flow?

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    Re: Hayward H250FDP Heater intermittent problem

    I went ahead and replaced the flame sensor. It is now working correctly.
    The below picture shows the old flame sensor (bottom one) compared to the new one.
    Surprised it was working at all.
    FlameSensor.JPG

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    Re: Hayward H250FDP Heater intermittent problem

    Hey did you even try to straighten out the old one and see if it would work? I wonder how that happened to it.
    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 H250FDP Heater intermittent problem

    Usually a good light sanding will cure the problem. This is actually a yearly routine maintaince. I am in the HVAC industry with several thousand maintaince contracts per year. Around 70% have flame sensors and need lightly sanded n a yearly basis.
    17K Gallons, Gunite & plaster, Hayward Ecostar VS, AquaCal SQ110, Ecofilter E5 (Zeolite), Pentair in line chlorinator, ProLogic P4 automation. Bought home in 2015. Very large caged in pool in Fort Myers.

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    Re: Hayward H250FDP Heater intermittent problem

    Quote Originally Posted by ps0303 View Post
    Hey did you even try to straighten out the old one and see if it would work? I wonder how that happened to it.
    I didn't think of that before throwing it away.

    - - - Updated - - -

    Quote Originally Posted by FM Pool View Post
    Usually a good light sanding will cure the problem. This is actually a yearly routine maintaince. I am in the HVAC industry with several thousand maintaince contracts per year. Around 70% have flame sensors and need lightly sanded n a yearly basis.
    I will keep that in mind for next year.

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