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Thread: Desired set temp past max on Minimax 400

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    Join Date
    Nov 2014
    Houston, Tx

    Desired set temp past max on Minimax 400

    My heater will only reach about 96 degrees inlet temp with either temp control knob set to max. If I turn the knob harder so I am past the end of the pot I can get it to relight but then it is in a non linear zone and it goes up to about 110 before shutting off. I have tried fiddling with the two pots on the back of the board which I have assumed are for trim but they have no detectable effect. How do I get the desired set point of 103 back into the range of the controls? Thoughts?


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    In the Industry

    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Desired set temp past max on Minimax 400

    You're probably going to need to replace the board.
    Paul 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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