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Thread: Pentair 250M Minimax Heater

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    Pentair 250M Minimax Heater

    Hello All,

    Today I tied the PVC back into the heater in hopes of the heater would work. The heater is a Pentair MiniMax 250M Minivolt Heater. Well as I figured it wouldn't be as easy as turning on a switch because it does not want to kick on. I took the front panel off and turned the gas valve to Pilot and hit the ignition, and the pilot stays lit. Then after I have the water running through it and I turn the switch to Pool and have the temp knob to hot. The burners don't come on...?

    Some questions:

    1. As I am looking through the manual it says there should be a lit diagnostic board showing power, service needed, ect. Well I don't see anything lit up on the front.
    2. Does this heater get its electricity from the water running through it? Because I don't see any signs of electric running to it.
    3. Any test I can perform before having to call a service company in hopes of being able to do it myself.

    Here are some pictures
    [attachment=0:2pq3gc82]pool_heater_3.jpg[/attachment:2pq3gc82]
    [attachment=1:2pq3gc82]pool_heater_2.jpg[/attachment:2pq3gc82]
    [attachment=2:2pq3gc82]pool_heater_1.jpg[/attachment:2pq3gc82].

    Thanks
    Attached Images Attached Images
    Fiberglass/Concrete IG
    Pool Size: 16500 gallons
    Filter: Hayward S244T Pro Series Top-Mount Sand Filter
    Pump: Hayward 1 HP Super Pump

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    Richard320's Avatar
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    Re: Pentair 250M Minimax Heater

    Quote Originally Posted by BNighGrow
    Hello All,

    Today I tied the PVC back into the heater in hopes of the heater would work. The heater is a Pentair MiniMax 250M Minivolt Heater. Well as I figured it wouldn't be as easy as turning on a switch because it does not want to kick on. I took the front panel off and turned the gas valve to Pilot and hit the ignition, and the pilot stays lit. Then after I have the water running through it and I turn the switch to Pool and have the temp knob to hot. The burners don't come on...?
    Start simple. You turned it to Pilot and lit it and it stays lit. Did you then turn the knob to "On"
    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: Pentair 250M Minimax Heater

    Can you see in where the pilot is lit? There should be a "probe", about 3/8" diameter, engulfed in the flame. This is the powerpile that supplies the millivolts to power the gas valve. It is possible that this is not putting out the proper amount of voltage for the valve to work. If you have a multimeter you can test for the voltage from this. Ideally it should be 750 Milivolts. They can work as low as 300-350 mv.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Pentair 250M Minimax Heater

    Start simple. You turned it to Pilot and lit it and it stays lit. Did you then turn the knob to "On"
    Ha sorry, Yes I turned it to Pilot for a minute or two, then turned it to "On" and it stayed lit.
    Then I turned on the filter, then turned it to pool (also tried spa) with the Temp knob all the way to hot.
    Nothing happen, no noise, and water was not any warmer, and got on my stomach and couldn't see the other burners on.

    Can you see in where the pilot is lit? There should be a "probe", about 3/8" diameter, engulfed in the flame. This is the powerpile that supplies the millivolts to power the gas valve. It is possible that this is not putting out the proper amount of voltage for the valve to work. If you have a multimeter you can test for the voltage from this. Ideally it should be 750 Milivolts. They can work as low as 300-350 mv.
    I do have a multimeter, what exactly should I be contacting with the multimeter? I see the "probe" you speak of where the only flame is coming out.
    Fiberglass/Concrete IG
    Pool Size: 16500 gallons
    Filter: Hayward S244T Pro Series Top-Mount Sand Filter
    Pump: Hayward 1 HP Super Pump

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    Re: Pentair 250M Minimax Heater

    Have exact same system and issue.... Watching attentively.
    Mel
    http://vinylcoveringsbymel.com/
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    Made in the USA

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    Re: Pentair 250M Minimax Heater

    In your last picture there is a wire (two conductors, red/white) hooked to the gas valve coming in from the right side. The white is hooked to the TH/PP terminal and the red is connected to the PP terminal. That is your powerpile wire. To test it, hook the leads of your meter to each of those. It can be done with them connected but it is better unconnected. Looking at the pictures again you may want to clean up all of the connections as any slight corrosion will cause resistance in the circuit and the voltage is very low on this type of system. If you find that the Milivolts is good then another test to try is to bypass the control circuit by hooking a jumper between the TH/PP terminal and the TH terminal. If you have a good powerpile and gas valve the burners should fire right up. If this happens then you have a bad sensor somewhere in the wire going out from the TH/PP terminal and back to the TH terminal.
    In the image I posted the "D" terminal is the same as your TH/PP terminal, "E" is your PP term, and "F" is your TH term. Part 5a and 5c is your powerpile.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Pentair 250M Minimax Heater

    Any chance someone can recommend where to buy a replacement powerpile? my local pool shop thinks it will be $90 which seems steep....
    perhaps in WNY as I am in Niagara....
    Mel
    http://vinylcoveringsbymel.com/
    we keep you coverd
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    Re: Pentair 250M Minimax Heater

    Quote Originally Posted by jrross
    Any chance someone can recommend where to buy a replacement powerpile? my local pool shop thinks it will be $90 which seems steep....
    perhaps in WNY as I am in Niagara....

    I am about 70 miles south of you. Down here we have a couple of local HVAC supply houses that I can purchase from. I am sure you have them in your area too. Do you have a heating contractor that you have dealt with in the past? They can be a good source for these items. I agree, $90.00 is a bit steep, $30-$40 is more like it on the retail side and $15-$20 on the contractor side
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Pentair 250M Minimax Heater

    If you do a Google search for the part#, 071515, the prices range from $45 to $70.

    http://www.parts4heating.com/Pool-Heate ... -s/786.htm
    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: Pentair 250M Minimax Heater

    Just found this one located in buffalo. He may let you pick it up in person... http://www.ebay.com/itm/REPLACEMENT-750 ... 2317f5f4a0
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Pentair 250M Minimax Heater

    Awesome thanks for the help guys...
    Mel
    http://vinylcoveringsbymel.com/
    we keep you coverd
    Made in the USA

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    Re: Pentair 250M Minimax Heater

    Ok so i replaced the powerpile and still no go... Tried jumping the circuit and nothing.... What next?
    Mel
    http://vinylcoveringsbymel.com/
    we keep you coverd
    Made in the USA

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    Re: Pentair 250M Minimax Heater

    So with the pilot lit, you tried jumping out the gas valve and it wouldn't do anything?
    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: Pentair 250M Minimax Heater

    Quote Originally Posted by ps0303
    So with the pilot lit, you tried jumping out the gas valve and it wouldn't do anything?

    correct
    Mel
    http://vinylcoveringsbymel.com/
    we keep you coverd
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    Re: Pentair 250M Minimax Heater

    Do you have a meter to measure the voltage from the powerpile? We need to verify what milivolt reading you are getting from the powerpile.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Pentair 250M Minimax Heater

    no I don't... guess I should just call someone....
    Mel
    http://vinylcoveringsbymel.com/
    we keep you coverd
    Made in the USA

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    Pentair 250M Minimax Heater

    Wow!
    I have the exact same unit and had the exact same problem ..........twice in 10 years.

    In my case, the problem turned out to be a balky pressure switch. It's a $5 item that costs $29 at the local pool store. But it's easy to replace yourself if you're so inclined - two wires and and a small wrench.

    For testing purposes, the switch can be bypassed by merely connecting the two wires together.

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    Re: Pentair 250M Minimax Heater

    I have basically the same heater (I have the 150M model) and I have the same problem (pilot lit, but heater won't fire). I tested the voltage across the thermopile leads and only got 185 millivolts. Does this mean the thermopile needs replaced? Or might it just be that it needs cleaned or something?
    Empty 16'x32'x(8' deep end & 4' shallow end) indoor inground pool, ~23,000 gallon, Sta-Rite 3/4HP pump, Minimax 150M Plus millivolt heater, Heldor PF-50 sand filter, Pentair Sand Dollar SD80 sand filter, Hayward Aqua Rite SWCG (T-Cell-15)

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    Re: Pentair 250M Minimax Heater

    After changing my Thermopolis without it helping... Changed out the thermostat module (3 inch square black box behind the knows panel and she fired right up...) hope there's no other issues.... Good luck guys.
    Mel
    http://vinylcoveringsbymel.com/
    we keep you coverd
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    Re: Pentair 250M Minimax Heater

    Quote Originally Posted by codyt
    I have basically the same heater (I have the 150M model) and I have the same problem (pilot lit, but heater won't fire). I tested the voltage across the thermopile leads and only got 185 millivolts. Does this mean the thermopile needs replaced? Or might it just be that it needs cleaned or something?
    That is a pretty low reading. Make sure the thermopile is in the pilot flame real good and you have a strong flame. Also make sure there is no corrosion on the leads which would give a low reading as well. If all that is good then I would suspect the powerpile to be weak. I have pulled them out before and tested them in the burner on my gas stove to be sure. Idealy you should see 750 Mv if it is good. They will range a bit above or below that number... 600-800 out of the box.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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