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Thread: Pentair MiniMax Short Cycling

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    Pentair MiniMax Short Cycling

    My MiniMax heater is short cycling. On for about 30 seconds then off about the same. I removed the flow switch and it seems to ne operational. Not sure how to test it. I checked the outputs and get 9.25K ohms between them whether the water is flowing or not. When unplugged the heater doesn't start at all and if I short the inputs to the control board it doesn't start either. Anyone know what the output of the switch should be? I'm not sure how to verify if the switch is bad.

    28K, IG plaster, Pentair DE Filter, Aqua-Rite swg

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    In the Industry
    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Pentair MiniMax Short Cycling

    A pressure switch won't short cycle the heater. It would prevent it from coming on if it indeed has failed Is this a MiniMax NT?

    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.

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    Join Date
    May 2011
    Orange County, CA

    Re: Pentair MiniMax Short Cycling

    Do you know that your heater is getting adequate gas pressure? I had a similar problem, and had the gas company out. They informed me that our old gas line to the pool heater was corroded and needed to be replaced. This was a bit pricey to do, but faulty gas lines are not something one wants running through your backyard! The MiniMax has a series of fault codes that can be determined by looking at the control panel as well as the control board. You should search for the MiniMax repair manual online for more info.
    38K in ground pool with attached spa. Current equipment: Easytouch 8 (521150) with IC-60 SWCG with web control by Autelis, 1x Pentair IntelliFlo 011018 pump (for filter), 1x Pentair 2HP WhisperFlo pump (for waterfall), 2X Pentair IntelliBrite 5G 12V lights, Pentair MiniMax400 NG Heater, Pentair SMBW2060 DE filter. Zodiac Barracuda MX8 cleaner on dedicated cleaner line. Lighting/home automation controlled by Insteon/ISY-99i.

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    Re: Pentair MiniMax Short Cycling

    Figured it out. It was the high limit switch shutting it off. Took the header off, cleaned everything, re-seated the limit switches and now the heater stays on.
    28K, IG plaster, Pentair DE Filter, Aqua-Rite swg

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