Question about Pentair MINIMAX NT TSI IGNITER

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I have a Pentair Minimax Nt Pool and Spa heater. I have just replaced the igniter and module. My problem is the fan and heater will come for approx. 5 minutes and then turn off. Then the digital display states E O 4. Ignition lock out. What does this mean. i had this same problem 1 year ago and I replaced the same parts. what wrong now?

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  • Pentair Master
  • 7,217 Answers

Check gas supply

Posted on Oct 30, 2017

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Posted on Jan 02, 2017

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  • 22 Answers

SOURCE: i have a Pentair MiniMax NT 250,000 btu pool heater that fails to

Two reasons.

1. There is air in the gas line. Power down the heater and allow it to try igniting until lockout. If it locks out, repeat the process. Most lines will clear within 4-5 attempts to ignite.

2. A plugged burner orifice. Run a small pipe cleaner in the brass fittings on the burner tray. They may have small webs in them restricting gas flow.

If the unit is a Standard (STD on the plate inside) it has a flame sensor that may also be bad. That sensor is on the end of the single wire that is cloase to the ignitor wire near the burners. Also check for a losse ground wire on the heater.

Posted on Dec 21, 2008

john224
  • 1378 Answers

SOURCE: 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.

Posted on Jun 23, 2009

  • 128 Answers

SOURCE: Pentair minimax nt just replaced ingnitor module

This means the air switch is bad.

Posted on Aug 23, 2009

  • 246 Answers

SOURCE: Minimax 250 Cycling on and off after reaching 20 degrees

change the assembly valve

Posted on Oct 13, 2009

  • 990 Answers

SOURCE: Purex Triton Minimax 400 pool/spa heater not igniting

This sounds like you have a problem with your pilot. You can check this with a small mirror to see if their is a spark when you turn it on. If you have any soot build up on the pilot that will stop the spark and keep it from lighting also. If you have a short on your pilot wire this could be the problem also. I hope this helps, good luck.

Posted on Dec 12, 2009

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1 Answer

How do i install an igniter in minimax


Pentair 472604 Igniter Replacement MiniMax NT STD Pool and Spa Heater

The ignitor is simple to replace, It is either a spark ignitor or a Hot surface ignitor. The above link will take you to a picture of the Hot surface ignitor, it is normal held onto the bottom of the burner tray, at right about the middle, by 1 or 2 sheet metal screws.

If a Spark style ignitor/electrode, then the bottom link is the one want to look at. Again, held in place the same way as above description.

Pentair 471090 Ignitor Electrode Replacement MiniMax 75 100 Pool and Spa...

Good Luck

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no, the replacement ignition module should be an exact replacement for the old one.

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