Question about Pentair MASTER TEMP HEATER 400 000 BTU NG LOW NOX HD EXCHANGER

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Pentair Master Temp Heater is not heating and reading 126

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Is it reading 126 all the time or only when you first start it up? will the fan run?

Posted on May 03, 2017

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Definitely bad thermistor Pentair reps have seen this happen a lot. Lick finger and touch the two contacts where the thermistor plugs in it should fire up if it's a bad thermistor. If you do an ohm reading you'll find that the ohms do not correlate with the temperature that's displayed. I just trouble shot one and I'm getting 51.2 ohms which equates to 10 - 20 degrees Fahrenheit which is obviously not what is being displayed because it's 126 which is a common number that's displayed when a thermistor is not reading properly

Posted on Apr 21, 2017

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Posted on Jan 02, 2017

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SOURCE: Pentair Minimax Nt heater wont turn on and heat,

Bad thermistor. The yellow wire that plugs into the control board. Lick finger and touch prongs. Heater should come on

Posted on Aug 30, 2009

  • 10 Answers

SOURCE: Pump problems?

Their can be a number of things.. Is the pump priming. Hopefully it did prime. what usually happens after running for awhile, with no cool water coming in. The water inside the pump basket starts to heat up, then the tubing turns to brownish on the input side of pump and exhaust side. (you could have air leaking in throught the input side, which could result in the pump never priming) Or if it is priming and no pressure (can mean your empellar is clogged up)

Posted on Mar 11, 2009

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SOURCE: Pentair Minimax Nt heater wont turn on and heat, "err" message

temp sensor get the new one with yellow wires.should do the trick.

Posted on Jun 05, 2009

  • 1 Answer

SOURCE: 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

Posted on Jun 22, 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

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When turning on power display reads 128 then error code r 13, after this it say's spa on but the temp reads 126 and the water temp is only about 68 so the heater never comes on.


This is not an error code. 128 r13 is the normal programming or software version for your model. you need to press the spa on button again, make sure the temp set point is higher then the actual water temperature

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Pentair heater will not light


This could be a temperature sensor issue, however you should open the panel and look at the ignition control module, there is a red light that will flash and based on the number of flashes it may tell you more information. Open the panel the. Try to fire the heater and watch the light and see which flashing sequence it gives you, post back with that information and we may be able to figure it out

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3 Answers

Have pentair easy touch controls just installed new water temp sensor. spa is 88 degrees but master temp heater shuts off because it reads 104. what should i check? the thermistor/


If the Easy Touch is reading the correct temperature, but the heater is not - you need to double check the temperature of the pool water with a standard pool thermometer.
Other things to consider:
1) The water is traveling too slowly through the heater. If the water is heating too quickly, then it will shut it off. If it takes a while for this to occur, then this would not be the issue.
2) Thermostat/thermistor is incorrectly reading the temperature of the water prematurely shutting the system down.
Make sure you really are checking the temperature of the water and matching this temperature up with one of the two readings that you are getting. Don't just take the word of the displays on either unit.

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1 Answer

Pentair 400 2 yrs old won't heat spa to 98 degrees F.


This could be a number of things. Most often it will be the internal by-pass. You find the assembly inside the water header, it controls water flow through the heater. When it goes bad it can open at a low temp and keep the water from going through the heater.
Also you will want to check the temp probe on the side of the header. If this is bad it will usually show up on the temp display though.

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1 Answer

Brand spankin' new Master temp 400 NG,won't heat past 77° spa is set at 101°,pool at 88°, does heater pool/spa temps have to be manually set to max(104 i assume) for intellie touch to...


if the intellitouch is properly wired to the heater, it should all be automatic and you should be able to control it all from the remote.

there should be three wires connected to the circuit board behind the manual control on the heater (labeled "POOL", "SPA", "Common"). Those are the wires that the intellitouch uses to communicate with the heater.

You can download manuals from the Pentair website.

www.pentairpool.com

Aug 24, 2010 | Pentair MASTER TEMP HEATER 400 000 BTU NG...

1 Answer

The heater won't start. The temp reading is 126 F all the time. The thermistor resistance changes with temp change. No diagnostic lights are on. Does it need a control board or is there another test?


Mine is doing the same. StaRite/Pentair tech support says the thermister needs to be replaced. I have one on order and will update on my status when I get the part replaced.

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2 Answers

Minimax pool heater cuts out at 91 degrees when remotely set for


Turn the temp set knobs on the front of the heater all the way up do both pool & spa temp.
If that doesn't help flip the selector switch on the front of the heater the pool temp. This switch doesn't control what heats up Pool or spa it just selects the heater on and which thermistat to use

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