Question about Pentair MINIMAX NT TSI IGNITER

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Pentair minimax nt 250,000 btu propane will startup, run for 30 seconds, service light comes on, heater restarts itself 30 seconds later. Will keep going just like this. Thanks in advance!

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The service manual for your heater can be found here:

This should help in determining the problem and steps to resolve.

Posted on Aug 22, 2009


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1 Answer

Pentair minimax nt propane heater is blowing black smoke

is heater installed in a shed? how many btu's is your heater. You need 1 square inch per 1000 btu's for combustion air opening. Lack of combustion air will cause heater to under fire and produce carbon dioxide

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Hope you are using lots of insulation. I have a bubble cover exposed during sunny days then put pool cover over at nite. Also have 4 x 8 ft Styrofoam pink insulation on top of the bubble cover. That costs $19 per sheet at Home Depot. 2" thick R 10.

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Can a Pentair minimax NT that is fitted for natural gas be retrofitted for Propane use

Probally the easyest convertion on the market. Where your gas line comes in the heater the line loops up over and down. There are two unions on this at the base of the loop. take these apart and their is a washer in one and you replace it with the Propane washer and put back together.

Sep 01, 2010 | Pentair Minimax NT Heater

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I have a pentair minimax 400dv ,my heater burner comes on for a minute and then,the burner cuts off. The fan keeps running, the burner will ignite again. This will do this several times. Eventually the...

Cleaning the Thermal couple can work at times, however most times you will need to replace it. You may also be having an issue with the ignition control. You are in pretty deep now and it would seem like you are determined to save this heater, I would change them both.

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My minimax heater 250,000 btu heater keeps sooting up. it ran for years fine my tech. has cleaned it twice in the last six months

Thank you for posting your question here on

Check all the burners for nice bright blue flames standing 3-4" off the burners when it lights. If any are heavily orange in color you need to clean out that tube and the jet in front of that tube. If they are mostly blue but short and wispy in nature check inlet and outlet gas pressures at the gas valve to ensure there is adequate gas. Finally, be sure there is adequate air flow into the heater. Not enough combustion air can cause sooting issues as well.

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!


Mar 25, 2010 | Pentair Minimax Ch 250,000 Btu Natural Gas...

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Minimax NT 400 TSI Heater problem

I bet that your 15 seconds of flame are more like 7 seconds. The time is very important. If the flame is not recognized after a specific time the valve is shut off. If the flame sensor is GOING bad but still make some rectification then you may get the issue you are having. I would start with the flame sensor and work from there.

May 03, 2017 | Pentair MINIMAX NT TSI IGNITER

1 Answer

New ignitor..still won't light

Clean out the pilot assemby or replace it. It is probably blocked by rust and/or spiders and is not letting enough gas (if any) through.

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