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Thread: MiniMax nt 400 heater carbonizing flame

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    MiniMax nt 400 heater carbonizing flame

    The flames on the burners of my heater are now bright orange and putting out lots of soot. What is likely the problem here and how do I fix it?

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    Richard320's Avatar
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    Re: MiniMax nt 400 heater carbonizing flame

    Orange flames and soot mean too much fuel or not enough air. I doubt the gas pressure just spontaneously rose, so something is blocking the air. Open it up and look for accumulations of spider webs or dust.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: MiniMax nt 400 heater carbonizing flame

    It could be mud daubers nest built up on the heat exchange.

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    ps0303's Avatar
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    Re: MiniMax nt 400 heater carbonizing flame

    Yep probably spiders or something in the burner tubes. Cleaning them on this heater isn't easy or fun. The worst part is trying to clean all of the soot off of the heat exchanger.
    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: MiniMax nt 400 heater carbonizing flame

    You guys nailed it and I thank you. I took out the eight burners and found the first two had mud daubber nests in the front of the tubes. I found that the brush designed for cleaning refrigerator coils was just right for cleaning the burners and it would go to the bottom of the tube. A little steel wool polished the outsides just right. Getting the burners back was not a simple task as it was difficult to get the tabs on the burner tubes back into the slots on the back of the cabinet. It is back together now and works well. As a footnote on this heater, the engineers on this design have a bit to learn - and I am a Mechanical Engineer. Why would they design a unit for outside installation that had a burner vent on top of the unit for all falling water to enter? A side vent or a snorkel tube on top would have been a better design. Also, why would they design a unit for outside installation that would allow a mud daubber to get to the burner tube? A little screen wire over the vents and other openings would have been better engineering. I see lots of engineering mistakes on the stuff this company sells.

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    Richard320's Avatar
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    Re: MiniMax nt 400 heater carbonizing flame

    Look how much money you just saved!

    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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