Question about Pentair Heater Thermistor Probe 471566

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How to replace hi limit switch on pentair minimax nt 471587 , 471694 pool heater

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Posted on Jan 02, 2017

  • 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

  • 139 Answers

SOURCE: I have a Pentair Minimax NT heater. The heater

sounds like a flame sensor

Posted on Jun 20, 2009

  • 15 Answers

SOURCE: Pentair Minimax NT 400 heater. fan keeps coming

Sounds like the controller is the problem. This is the circuit board that has the display and controls on it. You can swing that panel open and try tapping on the white plastic cover the controller is under that. This might get the fan relay to release but you will have to replace the controller it will stick again

Posted on Jun 23, 2009

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

  • 2 Answers

SOURCE: Pentair minimax pool heater (1 year old)

Board problem? Did you fix the problem?

Posted on Oct 19, 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

Jun 04, 2014 | Pentair Minimax NT Heater

1 Answer

I have a pentair minimax nt and the heater works fine but it turns of automatically around 92 deg. Any ideas , is it the hi 115deg. or hi 150 deg sensor?


I would most likely suspect the temp sensor rather than a Hi-Limit switch. In other words the temp sensor is thinking the water is hotter than it is and sending the wrong signal. Actually it sends nothing, the resistance changes as the water gets hotter and the main control board turns the heater on and off based on this resistance reading.

Aug 31, 2011 | Pentair Minimax NT Heater

1 Answer

When wiring a high limits switch (#471694) on the outlet side of the manifold, which side does the red wire go to?


The wires will go on ether side of the limit switches, so it won't matter wich way you wire it.

Aug 14, 2011 | Pentair Minimax NT Heater

1 Answer

My Pentair Minimax NT heater constantly displays "HI" on the LED readout, and never turns on to heat. As I understand the HI readout, it is an overtemp protection. I looked at the product manual and...


This could be high limits but more than likely this is a water flow problem. Check to be sure your by-pass is closed or nearly closed. If this is good then you need to remove the water manifold from the side of the heater. Inside you will find another by-pass assembly and you will need to replace this.
Before doing this you can take the wires from the limit switches one at a time and use a jumper wire to by-pass them. This won't tell you if they are bad though just if they are kicking off. If the water in the heater is that hot they are just doing their job.
Sort of a catch 22 but the best I can do from here. Hope this helps, good luck.

Oct 10, 2010 | Pentair Minimax NT Heater

2 Answers

The fan in the heater turns on but the heater does not turn on.


Probably a bad circuit board. I have the same problem once the water gets above about 82 deg. I tried cleaning the filter and strainer, cleaning out the heat exchanger, replacing the temperature limit switches, bypassing the pressure switch, and cleaning the ashes off the burner, and none of these worked.

Jul 30, 2010 | Pentair Minimax NT Heater

1 Answer

I have a minimax nt h lmt light on


You may have a dirty filter, not enough water flow. You may have a bad flo-control valve in the front header. Does the unit cycle? If not the hi limit may be faulty, check for 24vac accross the terminals.

Mar 05, 2010 | Pentair Minimax NT Heater

1 Answer

Pentair pool heater reads HI


thermister needs to be replaced. follow small yellow wires off control board to front header and thats where the thermister goes

Jun 21, 2009 | Pentair Minimax NT Heater

1 Answer

Pentair Minimax NT 400 heater. fan keeps coming


Sounds like the controller is the problem. This is the circuit board that has the display and controls on it. You can swing that panel open and try tapping on the white plastic cover the controller is under that. This might get the fan relay to release but you will have to replace the controller it will stick again

Jun 06, 2009 | Pentair Minimax NT Heater

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