Question about Pentair Minimax NT Heater

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Minimax NT cycles on, Flame stays on about one second then shuts off. It resets itself then cycles on again. About one second later flame goes out again. It keeps going thru this cycle. There are no error codes and the LED stays off. What is the cause of this problem? Please help Bill I had the exact same problem last year. The technician simply removed the and cleaned the gas nozzles. Even tough I have not been heating the pool I fire the heater every month for about ten minutes. Last week when I tried to fire the heater once more, the same problem happened again. The unit ignites for about 2 or 3 seconds and shuts off. The cycle repeat without stopping and with no error code. I tried to clean the nozzles but it did not work this time. Is this something simple I can fix myself or should I call a technician again?

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I had the same problem and it was the ignition mod after i replaced that it ran fine again .

Posted on Jun 01, 2009

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The igniter comes on, lights the flame but the flame only stays on for about 5 seconds and then the flame shuts off. About 1 minute or two later this cycle repeats itself.

There's a heat sensor that's in the path of the flame. It's supposed to detect when the flame is lit properly so you don't fill your house with unburned gas.

I'd bet that sensor has gone south, or maybe the wire going to it.

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I have a problem where the heater ignites easily, stays lit for 30 seconds, then turns off, then kicks back up in 30 seconds. Burners look great? Not sure what could be wrong?

If you have a pilot their will be a flame sensor that's part of it. If this is a glow plug start it will be a probe that goes through the fire wall and is just above the burners. When you get flame the electrons align so that you will get a signal back at the ignition control that will let teg heater run. If it dosn't get a signal it shuts down so you don't get a build up of gas. Then it reset's and tries again. What your describing is a bad sensor or wire. Could be carbon build up on the sensor. If you can't find any problems with these you may have a bad ignition control box. First I would check the wire, connectors and probe itself.

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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.

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