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    Pentair Minimax NT reading wrong temp, won't run long

    Well, maybe not so fast.... The next day the temp creeped back up to 99 when the pool was really only about 82. So I figured it was just bad and ordered a new probe (themistor). It came in and I decided to unscrew the old one and replace it. As I turned the old one out about 2 turns the temp...
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    Pentair Minimax NT reading wrong temp, won't run long

    Took it apart today. It was just showing a high temp, 99-104 when I started working on it. I read somewhere about how Trichlor tabs negatively affect the Thermistors which made me think about two years ago when I installed the Pentair feeder for tablets. I even installed a Jandy check valve...
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    Pentair Minimax NT reading wrong temp, won't run long

    I'll have to try it tomorrow to see what it does. From memory I think when I stop the pump or flip off the power to the heater and back on it has dashes for a few seconds and then reads 101 or some temp up to 107. I've seen it 99 but I don't think any lower. Water temp is probably only in the...
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    Pentair Minimax NT reading wrong temp, won't run long

    I've read the posts on other threads about hi-temp sensors and thermistor but wanted advice before I order a part today. Background: I haven't used heater in almost two years. I noticed about 3 weeks ago it said my water temp was 99 or 101 on the HEATER. I have an EasyTouch system which shows...
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    New gunite, plaster, liner? -how to do MAJOR repair of leaks

    Any more ideas from this intelligent crew? I trust someone out there has some insights that I do not. As of today we probably will not go the liner route. The 1st quote I had is that it "could be as much as $3500". He was going to break the concrete in the bottom and convert the fittings to...
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    New gunite, plaster, liner? -how to do MAJOR repair of leaks

    I personally have an in ground pool but I am writing tonight to request help and opinions for my neighborhood fountain. In my subdivision (small with 20 homes) we have a VERY large, round pool basin that holds a large tiered shaped (about 9 feet tall) fountain made of concrete bowls that water...
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    anyone know what this build up is inside heater?

    It is not asbestos. It is likely some sort of after burn. I'm not sure how it could be a venting problem. It is out doors and blows out like every other minimax. It crumbles and feels like very light sand in your hand (when crumbled with smallest squeeze) and then dip you hand in water and...
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    anyone know what this build up is inside heater?

    3 more photos to explain this mystery further. I asked the Pentair guy on the phone today and he didn't seem to think it was anything abnormal. :o The first photo shows some of the stuff in my hand. It is so light and just crumbles into nothing / dust when you pick it up. I did check it by...
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    wiring help replacing transformer Pentair Minimax NT heater

    Just an update for anyone interested in trying to replace your Pentair transformer with the one I mentioned above. I rewired with just the orange and black wires for 240V and it works fine. Voltage was exactly the same as the Pentair transformer. Both were at 26.7V. I have also blown my DDTC...
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    where to repair or purchase Pentair MiniMax DDTC board?

    My board must be bad and they are $275 on ebay and $300 on the internet stores. Does anyone know anyone who can repair the DDTC / PCB for the MiniMax NT? I mean I have seen guys to it to PC's and even circuit boards for automotive control units. Any help appreciated. Post or PM. Thanks,
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    ERR on Pentair Heater problem

    I do now believe I had a bad transformer and a bad DDTC after the lightning. Today I took the transformer off a buddy's Pentair Minimax NT (yes I have a friend with the same crappy heater :lol: ). I first tried his transformer on my heater hoping my voltage was slightly off and would fire up...
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    anyone know what this build up is inside heater?

    Natural gas, 400,000 BTU
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    ERR on Pentair Heater problem

    MiniMax 400 DV I have 24V coming into the panel now with a new transformer. If you are correct then that is at least $300. Any body out there working on PCB's for cheap?
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    anyone know what this build up is inside heater?

    Here is a larger/closer look at the flutes. It is actually the first two and the last one on the far left (that you can't see). None of the ones in between and I think only on this edge (that you can see). None further back in there. The pan underneath has some drips on it too. Notice the...
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    anyone know what this build up is inside heater?

    I have never seen a leak (even a drip) in or around the heater. Even though my heater power is off right now, water still flows through the heater and it is dry underneath there. It is very light and fluffy and will break off very easily. Almost like calcium, salt and "airy foam" but it also...
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    anyone know what this build up is inside heater?

    I am just curious. I am having heater problems (Pentair MiniMax see other posts if you can help) and while taking the cover off I noticed this residue. Any on know what it is?? And does it effect anything? Should it be cleaned out? Notice it is on the back wall in the photo too.
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    ERR on Pentair Heater problem

    I have a Pentair MiniMax NT heater. About 2 weeks ago I had a lightning strike which blew my 24V transformer. I replaced it and now I do get 24V on the orange and white wires that plug in P4 to the panel. When I turned the heater back on it tonight it flashes "Err" fast for about 5 seconds...
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    wiring help replacing transformer Pentair Minimax NT heater

    Thanks for the fast response. My transformer list 3 input voltages 240V (which is the top wire, orange) 208V (2nd wire, Red), 120V (3rd wire -White) and COM bottom wire-BK. I understand you to be saying to connect the new transformers top/orange wire to my plugs top wire (BK) and the Com-BK...
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    wiring help replacing transformer Pentair Minimax NT heater

    I have fried my new transformer and I need your help. I think I went wrong somewhere. I assumed you meant my Black and Red wires since my diagram was slightly different. (top down) Black--------------- Black-White--------- White-Red----------- Red----------------- I checked my voltage and...
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    wiring help replacing transformer Pentair Minimax NT heater

    Ohm Boy, Thanks for the input. And thanks for taking to the time to draw something up and try to help me. Sounds like you are the right guy to speak to this issue. Interesting thing I noticed today when I remove the side cover to the heater. There was an updated wiring schematic on the...
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    wiring help replacing transformer Pentair Minimax NT heater

    so would you guess that the bottom wire (red on the old one) is in fact COM (which I suppose means ground)? according to the new instructions the bottom wire - black is COM.
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    wiring help replacing transformer Pentair Minimax NT heater

    Pics of the two are below. The old Pentair transformer had a black plastic cover that I just broke off to see inside. Notice how the wires go opposite directions from the new one but when opened it up, it looks like they solder at the same point inside. It looks like all four wires...
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    wiring help replacing transformer Pentair Minimax NT heater

    I believe a lightning surge blew transformer on my Pentair Minimax heater. PB did not tighten ground wire in easytouch panel. I could pull the wire out of the grounding block so easy with my little finger. I suspect that caused the "frying" of the transformer. I used an ohm meter and get no...
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    any experience with spring check valves or Compool 3 way?

    I am trying to keep my spa from dropping an inch or two when actuator switches from pool to spa and back especially during freeze protection. It can drop several feet over night and go dry. So I think I will put check valves on the pool skimmer and pool drain lines right before the 3 way and...