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Thread: Help with Purex Minimax 400 Heater

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    Help with Purex Minimax 400 Heater

    I have a Purex Triton Minimax plus 400 that shuts off after the heater has been running for ~ 1 minute. What things should I look at to trouble shoot the problem?

    It seems that the problem is related to heat. I pulled off the main header and check the baffles for blockage and all seems fine. Could this be a problem with a thermostat which is shutting down the unit?

    Also noticed the pressure sensor is looking worn. But if this was bad I'm thinking the furnace would not fire at all. Is this correct?

    Anybody have advice?
    St. Louis, MO
    20,000 gallon vinyl in-ground pool (old-maybe 20yrs?!) - new sand filter (20 GPM) and motor (1.4 HP) - Taylor K-2006 test kit - bought the house w/pool summer 2010 - still learning - thinking about converting to salt

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Help with Purex Minimax 400 Heater

    Sounds like the high temp cutout. I'd start there.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Help with Purex Minimax 400 Heater

    Found out when we first had ours installed that I needed to bleed the air from then newly installed gas line. It took a minute or so and then worked just fine. Possibly there could be some air causing it to kick off because not enough gas is present. Just a guess.
    [ Vogue Vectra 24' AG | Hard plumb: Hayward Power-Flo Matrix 1HP 2-speed, 27" sand filter & Pentair MiniMax 100 NG | Taylor K-2006 | Central IL ]
    Powered by: TFP, PoolMath & TFTestkits

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    Join Date
    May 2011
    Orange County, CA

    Re: Help with Purex Minimax 400 Heater

    We have the same heater, and had a similar problem when we first bought our house. The heater would run for about a minute and would then stop and I'd hear the clicking of the piezo starter. At first I thought this might be a problem with the gas solenoid valve, or due to a spider web or something. I had my pool guy come over and check it out and he spent about an hour cleaning things out, to no avail. Then he did a pressure test and found that the gas coming through the line was very weak. We ended up having to replace the 125 foot gas line because it had rusted out. I have no idea how old the gas line was, but I believe it was either black pipe or galvanized. In any event, it had to be replaced and in the process, I noticed how trashed it really was. I'm amazed that any gas at all came out. In any event, we had a trench built and ran new polyethylene pipe (yellow) that transitions to coated steel risers. Now the heater runs great. Unfortunately, this was a pretty expensive fix, but we were also able to run new electrical and communications conduits to the pool house. You definitely should do a pressure test to make sure your heater is getting enough gas.
    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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