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

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Pentair MasterTemp 400 is reading 122f but wont turn on. No error codes or flashing lights.. all else is fine. Does this mean my Thermistor is out? I would like to replace it myself, where can I get the part and instructions to do it myself?

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6ya6ya
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Posted on Jan 02, 2017

  • 990 Answers

SOURCE: I have a Pentair Mastertemp 250 pool heater with

This is an ignition flame falure code. Could be you don't have gas getting to the pilot, no spark to ignite the pilot or your ignition is not reading the flame. Sorry to say but it's probally time to get the pool guy out to look at it. Good luck.

Posted on Apr 15, 2010

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SOURCE: heater cycles on / off

This could be a water flo problem. you need to chech to be sure your by-pass valve is closed down enough to force water threw heater, There is a internal by-pass that could be a problem also, or a bad pressure switch. If the by-pass isn't the problem then you should check these also.

Posted on Jul 26, 2010

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SOURCE: buying a pool heater. Which brand best reliability

Both of those heaters are fine I prefer the Pentair for it's smaller footprint and ease of installation as you can turn it for access to plumbing. The Hayward is tougher to turn the exchanger on and you only have right or left as options for the plumbing to come out. Sta-Rite is still my favorite for installation being easy to plumb, wire and run gas to. It's very easy to change from natural to LP also.
Most heaters today are the same in reliablity and that is mostly up to you to keep the chemicals correct. Being in the business I always look to ease of install and access for repair.

Posted on Oct 17, 2010

Testimonial: "Thanks for info from an expert. Think I will get a pentair as they are sold in UT. Wholesaler doesn't even carry Hayward. So Techs aren't used to. "

UglyPoolGuy
  • 46 Answers

SOURCE: have pentair easy touch controls just installed

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.

Posted on Dec 10, 2010

  • 94 Answers

SOURCE: Pentair mastertemp 200 will work for a while and

If you are firing, and then going off and getting an E05, your igniter is to blame. It may be glowing but it's getting weak. The diagnostic goes further but that is usually the fix. with inactivity, the igniter is always to blame. You really need to fire it off weekly to make it reliable.

Posted on Feb 25, 2011

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I have a Pentair Mastertemp 250 pool heater with an error message E05. What does this mean?


This is an ignition flame falure code. Could be you don't have gas getting to the pilot, no spark to ignite the pilot or your ignition is not reading the flame. Sorry to say but it's probally time to get the pool guy out to look at it. Good luck.

Apr 15, 2010 | Pentair Mastertemp Heater

1 Answer

Pentair MasterTemp 400 Heater Will Not Fire


Long story but bingo just at the end. The thermistor is generaly the problem with what you describe. it is an inexpensive part and easy to replace. You will not generaly find this in your book. Your E5 code is just because the unit hasn't started yet. Good luck.

Jan 25, 2010 | Pentair MASTER TEMP HEATER 400 000 BTU NG...

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