Question about Pentair Minimax NT Heater

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I turned the heater off for 3 weeks and now when I turn it on it displays EO4 and runs cold for 60 seconds then off to EO4. I have removed the ignitor on the right but the part on the left next to the ignitor is unknown to me. We have had the heater for 3 yr with no problems until now.

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If this is a MiniMax NT STD heater, the part on the right on the bottom is not the ignitor, it is the flame sensor. The part on the left with 2 wires is the ignitor. The E04 code is for a fan failure. This means that either the fan is seized, or the air switch is bad, or the air switch tubing is cracked (this is most common)

If you hear the fan is going, then turn off heater and check the air tube connected to the air switch (3" round disk on right side under the square steel enclosure with 2 wires coming off it on the front).
Remove the tube and inspect it to make sure there are no cracks.

If the tubing is good, and the fan works, you need a new air switch.
If you know how to use a multimeter and/or just need more help, you can reach me @ adamh@newconceptchem.com

Posted on Jan 07, 2011

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One other possibility -- this happened to me. There were trees near the unit and some leaf and twig debris had manged to work their way down into the fan. Not enough to stop it, but slowed it down and/or impeded the air flow enough to cause the air switch to register insufficient flow and throw an E04 code. Cleaning the debris out fixed the problem.

Posted on Jan 28, 2011

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