Question about Pentair MiniMax 100 Aboveground 100,000 BTU Propane Gas Electronic Heater

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Minimax 100 blinking red light

Will not fire, see blinking red light

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Calling for heat check safety circuit and gas and ignitor

Posted on Oct 07, 2017

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Posted on Jan 02, 2017

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I have to turn power switch off then back on on my minimax NT , then service light will flash once blower comes on for 20 sec. then shuts off i have nothing. What part should i throw at it first


Any fault codes?
what about the flashing Red light?
how many times is it flashing quickly? It will pause between message/code of quick blinks.
To assist, more info needed.

Jun 02, 2015 | Pentair Minimax NT Heater

2 Answers

Ignition is locked out unit will not fire


Turn it off at the black toggle switch inside the front panel or turn it off at the breaker for 2-3 minutes
Then try again.
Check that flow is good, gas is on ect...
Is it saying lockout on the display?
If not then as you fire it up after cutting power keep the panel off and watch the ignition control red diagnostic light.
The blinking sequence of that light should point you in the right direction. There is typically a label that will tell you what the blinks mean.
Minimax nt heaters are on borrowed time, and in most my Delong with them once they start having an issue it will never end , basically they are lemons and replacements for them is very common

Mar 28, 2015 | Pentair Minimax NT Heater

1 Answer

I get an EO5 code (3 red blinks) on the Pentair model 4300 TSI. I changed the ignighter but still the code is the same. There is no fire to the burners?


If your gas is on, and the ignitor is good, and your sure there are no wire shorts, the only other options are the gas valve or the flame rectifier. I would put my money on the flame rectifier. It is located right next to the ignitor, and is very inexpensive to replace.

Apr 16, 2012 | Pentair MINIMAX NT TSI IGNITER

1 Answer

Heater will not come on and there is no error code. The power light is on.


Is there any lights on? If there are and still no error code, just blinking lights. Check the thermistor. I had a similar problem. Heater had power, lights were on SW was green but no error code and would not fire up. I replaced the thermistor. It took me all of 5 minutes and heater fired up and is working great.

Jun 19, 2011 | Pentair Minimax NT Heater

1 Answer

We have a pentair minimax 100 pool heater it was working the other day, now our pool is cold as it won't even try to ignite. does anyone have an idea as to what part to start with replacing to see if we...


start with pressure switch,likely out of adjustment or it could be faulty.if you're going attempt to adjust,press sw,you should be familar with using a multi-meter.improperly adj could result in ruining htr and possibly a fire hazard

Jun 21, 2009 | Pentair MiniMax 100 Aboveground 100,000...

1 Answer

Pentair Minimax 250M


how many times it blink will tell you what is wrong check at the codes. unplug thermostat check fo homs 10 k around is fine at 80 degrees pressure switch require a by pass but DO NOT RUN THE HEATER WITH A BY PASS ANY CONTROL!!!!

Jun 17, 2009 | Pentair 250k Minimax Ch Ng Mv Heater

1 Answer

Pool heater wont fire up


check pressure switch for continuity with pump on

Jun 07, 2009 | Pentair MINIMAX NT TSI IGNITER

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