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Thread: Replacing a Jandy 8124a?

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    Replacing a Jandy 8124a?

    Hi, I have a Aqualink RS 8124a (assembly 8125) board with a HIGH reading on the water sensor. Way high (115-degrees). The trouble shooting says to replace the power PCB. The original is a Assembly 8125 with a PPD 8156MMM. I have been given a used but working 8124a unit with a 8159K PPD.

    Should I swap the PPD before I replace the unit? Or leave it alone. The replace unit I was given is a known working unit.

    Also, I have seen a TECH note from Jandy/Waterpik that says I may be able to solve the problem by CLIPPING the 3 transorbs on the board (near the sensor header). Has anyone tried this fix?

    Mark
    22,500 gallon, vinyl lined, cartridge, salt walter pool

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    Join Date
    May 2007
    Location
    South Central NJ
    Posts
    3,192

    Re: Replacing a Jandy 8124a?

    As a test, swap the lead with the air sensor. If the temp drops to the air temp, its the probe, not the board.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Replacing a Jandy 8124a?

    Good troubleshooting tip, but I confirmed It's the board. The sensor swap doesn't fix the issue. Jandy says in their tech note that there is a Transorb (1.5KE10A) across each sensor port which may be blown. Easiest fix is to just SNIP it off. I will try and replace it first since I have some transorbs on hand.

    Also, Any idea what the PPD difference between a 8156 and a 8159 chip is? I know the "K" versus "MMM" software revision means, but no idea what a 8156 and 8159 chip. I assume that the letters is all that matters.
    22,500 gallon, vinyl lined, cartridge, salt walter pool

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    Join Date
    May 2007
    Location
    South Central NJ
    Posts
    3,192

    Re: Replacing a Jandy 8124a?

    Not a clue.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Replacing a Jandy 8124a?

    Quote Originally Posted by markharris View Post
    Hi, I have a Aqualink RS 8124a (assembly 8125) board with a HIGH reading on the water sensor. Way high (115-degrees). The trouble shooting says to replace the power PCB. The original is a Assembly 8125 with a PPD 8156MMM. I have been given a used but working 8124a unit with a 8159K PPD.

    Should I swap the PPD before I replace the unit? Or leave it alone. The replace unit I was given is a known working unit.

    Also, I have seen a TECH note from Jandy/Waterpik that says I may be able to solve the problem by CLIPPING the 3 transorbs on the board (near the sensor header). Has anyone tried this fix?

    Mark

    Mark,

    I tried to PM you but it looks like it didn't actually send. Please PM me re: your old Jandy board, I am interested in the old MMM chip if available.

    Thanks,
    Russ

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