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Pentair minimax nt temperature will not show between 80 and 89 degrees

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  • Pentair Master
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Sounds like bad temp sensor should ohm out at 78 ohms if not need new one

Posted on May 26, 2014

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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

  • 1 Answer

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

  • 128 Answers

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

  • 990 Answers

SOURCE: E04 comes on after fan purge cycle-Pentair minimax nt pool heater

This is a fan falure code. It can mean the fan has problems (not likley if the fan goes and isn't labored) You have a sensor in your exaust (probally not this if you don't get a good start) The culperet is probally in the negetive pressure sensor. This is a 2-3 inch disc with wires going to the controls and a rubber tube going to the fan. Pull the tube from the fan and make sure the fan fitting is clear (poke with a tooth pic) Be sure their are no kinks in the hose. If the heater is 4 years old the diaprahm could be bad in the pressure sensor. Check the other things first but this is probally your problem. Good luck, hope this helped.

Posted on Jan 26, 2010

  • 64 Answers

SOURCE: 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

Posted on May 24, 2010

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1 Answer

Getting ERR message on my Pentair Minimax


make sure filters are clean then check to see if voltage on both sides of pressure switch if so check to see if voltage to ignitor if so ohm out ignitor should be about 78 ohm at 70 degrees if ok then see if safety circuit is ok then check to see if 24 volts to the gas valve brown wire and yellow wire

Jul 26, 2014 | Pentair Minimax NT Heater

1 Answer

Error codes


You have a bad thermistor. The heater thinks that water temp is over 114 degrees.

Aug 14, 2013 | Pentair Minimax NT Heater

1 Answer

My minimax nt only heats till 90 degrees. I set it up to 104 which is the highest and it only stays at 90 degrees. Everythig seems to be working well, no errors either. Please advice.


Either the thermostat board is defective, the temperature sensor is defective or not enough heat is being produced by the heater. . I recommend you call the Pentair technicalsupport at 800-693-0971 and they should be able to help you figure this issueout. I hope this helps.

Please vote on this answer. Thank you.

Aug 25, 2011 | Pentair Minimax NT Heater

1 Answer

Pentair Pool Heater reads HI


I am not sure if you have found the answer to your issue, or not, but just in case. The display showing HI means that the heater is "reading" the water temp at over 114 degrees.

This will go away if you change out the Thermister on the inlet manifold for the heater.

Jun 06, 2009 | Pentair Minimax NT Heater

1 Answer

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

May 29, 2009 | Pentair Minimax NT Heater

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