Question about Pentair Pool & Spa

1 Answer

Pentair Mininmax NT natural gas pool heater. Unit has power, water pressure and gas. Display shows correct water temp and the desired temperature. Unit does not switch on either manually or in automatic. what do I check next? Thanks

Posted by on

  • wadesmail Jul 01, 2009


    Thanks for the taking the time to reply

    Nothing is happening when I try to turn the heater on. The displayed temp will show the current temp of the pool water (76 degrees) and when I manually raise the temp, the value is displayed on the panel but does not turn on the heater.

    I have checked the led inside and the light is not coming on.
    I do have the manual- thanks for posting the link.
    No error codes are displayed on the panel. the unit "appears" normal.

    I'm wondering if the thermostat is causing the problem. Is there a way to test the thermostat?

    any ideas?





1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 83 Answers

The Dianostic Lights when trying to start the heater is where to go next. When you tried to start the heater manually, did you have your automation system turned off so you can start it manually? If you did, when you tried to start the heater, wht happened? Did you receive any error codes? Were any of the System Indicator lights on? If you open the right hand side door, there will be a part with FENWAL on the sticker-near the top of the heater. Next to the word FENWAL, you should see a small arrow pointing up, there is a Red Diagnostic light above the arrow, is it flashing, and if so, how many times?

If you do not have an Owner's Manual for the heater, follow the link below and it will take you to one online. There are some trouble shooting ideas there also.

Posted on Jul 01, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

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

Mar 07, 2016 | Pentair Master Temp 400K BTU Natural Gas...

1 Answer

I have a Master Temp 250 pool heater that shows an AGS error on the back of the board. The heater runs for about 20 seconds then shuts off, any ideas?

AGS = Auto Gas Shutoff...
What is happening is the heater is monitoring (or sorta, by reasons difficult to explain here) Water Flow and Water Temperature. In this case, the AGS is triggered by a low water flow, or high Incoming Water Temp.
High internal water temp = triggered AGS.
If you have and can confirm, PROPER water flow, water temp coming into heater is Lower than 104°, then it is possible you have a faulty AGS.
But in most cases, it's only doing its job. Locate the reason for the fault, or why the AGS Switch turned the heater off.

Jun 05, 2015 | Pentair Mastertemp 250 Natural Gas Pool...

1 Answer

Reset water temp in pool

Up and down arrows on a digital unit will adjust temperature to higher or lower desired temperature.
Potentiometer knob will adjust temp higher or lower by rotating the knob.

My answer is only a guess at the question you are asking - no specifics, too general and too basic.

Jun 02, 2015 | Raypak 266A Digital ASME Natural Gas IID...

1 Answer

Pool heater won't heat water

How big a pool? You normally will not notice a temperature rise immediately. On average, swimming pools will see a one degree rise in temperature every 45 - 90 minutes.

Jan 22, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Pentair Minimax NT heater -- panel doesn't respond.

if connected to control make sure heat is enabled

Jun 22, 2017 | Pentair Minimax NT Heater

1 Answer

Pentair matertemp 400,000 BTU heater cycles on & off

My pentair matertemp 400,000 BTU natural gas heater cycles on and off before reaching desired temperature. I completely cleaned the DE filter and flow should not be an issue. When running the spa the pressure is 25. When running the cleaning system (polaris pop ups) the pressure is 30. Burner fires for 80 seconds then shuts off, reignites after 53 ceconds.Any tips on what might be the issue with the heater

Apr 04, 2010 | Pentair Mastertemp Pool & Spa Heater Dual...

1 Answer

Pentair MiniMax NT pool heater not working

check breaker maybe popped check ignitor

Sep 29, 2017 | Pentair Minimax NT Heater

1 Answer

BiAnnual maint of Pentair Minimax NT Low NOx Series Pool Heater

if unit is sooting check gas supply and pressure unit is overheating and ruining its self

Sep 26, 2017 | Pentair Minimax Ch 250,000 Btu Natural Gas...

Not finding what you are looking for?
Pool & Spa Logo

Related Topics:

296 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pentair Pool & Spa Experts

Jay Finke
Jay Finke

Level 3 Expert

1384 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8841 Answers

Brad Brown

Level 3 Expert

17446 Answers

Are you a Pentair Pool and Spa Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides