Tip & How-To about Pentair Minimax NT Heater

ERR code

When a heater is showing the ERR in the display panel, this is what Pentair classifies as a "hard lock out". Basically, there is something wrong with the heater and needs to be serviced. There is no way to reset this code, since there is a malfunction within the heater itself.

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I have a Pentair MiniMax NT. I am getting ERR on the display but I can't seem to get the door open. I have tried turning the single screw that locks the left and right door but it won't unlock.


sometimes the door is just stuck. try pulling the door as you turn the locking screw. sometimes you need to use a flat head screw driver to help the door open as you turn the screw back and forth

Jun 11, 2011 | Pentair Minimax NT Heater

2 Answers

error code e04


If the fan was seized, it is likely bad, even if you freed it. If it doesn't sound the same, or is not as loud as it used to be, it is also most likely bad. If it doesn't move enough air to close the air pressure switch, then you will get an 04 fault, which is an air flow fault. HTH

May 23, 2010 | Pentair Minimax NT Heater

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