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Thread: Pentair Minimax 400 Flange bolts rusted

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    Join Date
    Feb 2018
    Walnut Creek/CA

    Pentair Minimax 400 Flange bolts rusted

    Have a Pentair MiniMax 400 heater for 20 years. It still works but we hardly use it for the pool because we have solar. Now, I have a small water leak on the outside large water flange and the bolts are rusted. Itís where the two water pipes go in and out of the heater.
    Iím afraid to try and loosen it for fear of braking the bolt, then what? Anybody have any ideas to removing/softening the rust prior to trying to remove the bolt?
    18k Gallon In-ground pool/spa Pebble Tec Plus w/waterfall, Hayward ProLogic Controller-16 plus extension, Hayward EcoStar SP3400VSP, Hayward TriStar, Hayward Booster, Polaris 380 Black Max Pool Sweep, Pentair Clean-N-Clear Plus 420 Filter, Pentair Rainbow 320 Chlorinator Feeder, Paramount Para Level Auto Water Leveler, Pentair Purex Triton MiniMax 400 Heater (21 yrs), (7) 4x12 solar panels (21yrs).

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    In the Industry

    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Pentair Minimax 400 Flange bolts rusted

    You could try to spray it down with some WD40 or similar. If you break it, then you'll be down for a while trying to get it out and if you can't then your stuck.

    Usually they are frozen and you can't get them out or they snap off. Either way, you sort of in a tight spot.
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