Question about Pentair Minimax CH Heater

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My inground pool heater stopped working today after it was on for about two hours. I checked the pilot and it was still lit. Where can I start to trouble- hoot this on my own. The unit is four years old.

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 139 Answers

SOURCE: I have a Mini Max 100 pool heater. The pilot

check pressure switch for proper adjustment and make sure filter is clean so system pressure is normal

Posted on Jun 21, 2009

  • 7 Answers

SOURCE: pool heater won't kick on

check the gas line pressure; (if this was a homeowner installation you will not be able to check the gas pressure) dirty filters are the number one cause of heater malfunction. before you do anything else break the filter apart and clean completely and recharge with diatomaceous if applicable. also check the pump baskets and make sure there is no debris in the basket or blocking the impeller inside the pump. if this doesn't solve your problem call pentair tehcnical support

Posted on Jun 25, 2009

  • 9 Answers

SOURCE: Have a Triton Millivolt pool heater pilot is lit and nothing!!

Low out put voltage from the pilot generator and/or an open circuit in the control circuit...the most common is a bad pressure switch (dirty filters can hamper pressure switch operation).

Posted on Jun 28, 2009

  • 1378 Answers

SOURCE: Have a new pentair mini max ch 250000 btu. Was

Thank you for posting your question here on

For warranty service on the heater use the dealer locator found on Pentair's site here:

Choose service only and check the heater box in the product line section. If no one comes up, expand the service radius (distance) on the right side of the page.

You should not attempt to repair the heater yourself as doing so may void your warranty coverage. The only thing you should be sure of prior to arranging a warranty service call is to make certain your filter is clean and that the pressure gauge is operational. A dirty filter can cause the heater to sit idle due to low flow in the system.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


Posted on Jun 24, 2010

  • 15935 Answers

SOURCE: The heater work for about four hours this year and

Thermocouple is likely full of carbon deposits.

You'll need to clean it, or replace it - if that does not work.

Use some fine-grit sandpaper or steel wool to try to clean it up and re-try.


Posted on May 27, 2011

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1 Answer

Why will my hayward h 250 millivolt pool heater pilot light not stay lit

Looks like your pilot generator may have some corrosion on it. Follow the stainless steel tubing on the gas valve as it goes down to the burner area. At the end of this is the pilot assembly. If you can remove this so your able to work on it you will se a short metal rod that the pilot flame touches when lit. This generates current that keeps the gas flowing to the pilot to keep it lit. Take some sand paper and give it a light sand to remove any corrosion on it. Reassemble at put it together. You may also need to clean the pilot tube(stainless tube from valve). Small spiderwebs can reduce the flow to the pilot and cause this problem also

Jun 25, 2014 | Hayward 250kbtu Ng Pool Heater - Inground

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To see if the pilot itself is lit first remove the front cover. Near the bottom left hand side of the cabinet with the cover removed, look just above the burners you will see an oval hole punched out of the front panel. You can look inside the small opening to see if the pilot is burning. You may need to look on a bit of an angle to the left side of the burners and your should see it

May 24, 2014 | Hayward 250kbtu Ng Pool Heater - Inground

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How do you light the pilot of a Hayward Heatmaster 400

If you have a pilot that need's to be lit you turn your gas valve to pilot and hold it down while you light the pilot and keep it down for 30-40 seconds to let the thermopile heat up enough to hold the gas valve on by itself. Then turn the gas valve to on.
Most heaters now will have an electronic ignition for the pilot or a hot surface ignitor. If you have power going to the heater then you have one of these heaters.
Let me know how you do. If it is one of these we can go further. Good luck.

Jan 31, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

Pilot light will not stay lit, have full tank of propane gas

clean or replace the flame sensor

this link is for the parts diagram
if this helps please vote

Nov 12, 2009 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

Pilot wont stay lit when i let go the button stays lit when i hold it down

Check the generator output to be certain it is above 400mV. If not, replace the generator. Otherwise repair or replace the entire pilot assembly, it is likely clogged down at the head of the pilot.

Jul 03, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

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Pilot will not stay lit after button release

most likely you have a thermopile that has low output. it takes about 100mv to maintain pilot light

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check gas pressure might be running out of pressure gas meter might be too small and heater could be overheating

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Pilot light is lit, but heater will not fire

Make sure thermostat is set higher than water temperature. Make sure pump is running and water is flowing through unit. If gas valve is not opening then flame sensor or gas valve is bad.

Jun 02, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

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Check pump is working, if so could be stuck flow switch or gas valve fault get unit serviced

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