Question about Pentair Minimax Ch 250,000 Btu Natural Gas Pool Heater Millivolt Ignition

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The minimax 250 M does'nt ignite , how do you start it ?\

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: I have a pentair minimax nt dv 250 It is a unit

I had the same situation in FL. Rats ate the wiring harness. Take off the cover panel and visually inspect.

Posted on Jan 21, 2010

  • 990 Answers

SOURCE: Minimax NT heater is knocking. Could it be gas

More often than not this will be the by-pass and thermal regulator. Both of these are inside the water manifold on the side of the heater. I will usually replace both if one is bad. If one is bad the other can become damaged and the labor and parts to do this are a big part of the job. Also check and see if you have a by-pass on the plumbing going to the heater. This will be a valve bridging the water in to and out of the heater. If you have one it should be 80-90% closed so it forces water through heater. If any of these are bad it will let water go past the heater and the water inside the unit will overheat and turn to steam and with no place to go it just expands and starts banging.

Posted on May 17, 2010

  • 46 Answers

SOURCE: I have a minimax nt

We have this part number in stock and ready for shipping. (MANUFACTURER NUMBER: 472362) They range in price online from $399-$459.00 but since you are a FIX YA member, we offer a special discount to you. Your cost, from us, is $379.00 plus shipping. We have 2 in stock but expect there to be a pretty good run on replacement parts with the freezing across the country. Comes complete with Gasket.

If you want to search elsewhere, just put the part number in your search bar. You can reach us at: or by calling 602-714-3880. uglypoolguy_0.jpg

Posted on Feb 02, 2011

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SOURCE: My pentair minimax plus 250 M pool heater won't

For most pool heaters, if they will not start up in the spring, the problem is corrosion in the wiring somewhere... I would remove and clean all wiring connections and then try. The amount of current is very small and so any bit of corrosion can cause the unit not to work.

It all so could the t-stat again, but you would need to check that with an OHM meter. No continuity when the heater should be on will confirm that the t-stat is bad...


Posted on May 14, 2011

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1 Answer

How do i install an igniter in minimax

Pentair 472604 Igniter Replacement MiniMax NT STD Pool and Spa Heater

The ignitor is simple to replace, It is either a spark ignitor or a Hot surface ignitor. The above link will take you to a picture of the Hot surface ignitor, it is normal held onto the bottom of the burner tray, at right about the middle, by 1 or 2 sheet metal screws.

If a Spark style ignitor/electrode, then the bottom link is the one want to look at. Again, held in place the same way as above description.

Pentair 471090 Ignitor Electrode Replacement MiniMax 75 100 Pool and Spa...

Good Luck

Jun 04, 2014 | Pentair Minimax NT Heater

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Pentair minimax nt explosive ignition

Problem is an obstructed gas oriface. The burners light from the burner closest to the pilot assembly out like a dominoe effect. The explosion is because the gas has to make its way over to the pilot from a further burner thus filling the firebox full of gas before it ignites. This blockage is most commonly from a spider web inside the oriface itself. Pull the burner tray, remove the orifaces from the tray and look through each one cleaning them out with a toothpick from the backside. The orifaces should be threaded on the gas line coming off the gas valve (looks like a silver box inside the front panel)

Feb 16, 2012 | Pentair Minimax NT Heater

1 Answer

Winterize minimax heater

Lost the manual to my heater. Would like to know how to
winterize the heater. mini max ch 250 M

bl.wilson @ .. thank you, hope you can help me.

Oct 03, 2009 | Pentair Minimax NT Heater

1 Answer

Need to reignite the heater and the instructions on the panel are paritially destroyed. it is a minimax plus 250 and have tried finding the instructions on line

For an Owner's Manual for the MiniMax Plus heaters, which does contain start up proceedures for the electric and millivolt models, you can follow the link below.

Make sure that you follow the directions for your particular model of heater.

Jul 05, 2009 | Pentair MINIMAX NT TSI IGNITER

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