Question about Pentair Minimax NT Heater

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The heater ignites then after a few seconds it shuts off then continues to ignite and shut off

Heater ignites then goes on and off

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  • 44 Answers

Stack flue sensor or ignitor

Posted on Dec 11, 2014

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Posted on Jan 02, 2017

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SOURCE: jandy lite2 heater

t problem is not at the ignator but t flame rectification need ignator kit and flame rectification kit

Posted on Sep 18, 2009

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SOURCE: Minimax 250 Cycling on and off after reaching 20 degrees

change the assembly valve

Posted on Oct 13, 2009

  • 990 Answers

SOURCE: I have a 250K mimimx nt heater that has been

This is a fan code. If your fan is running then the air pressure switch has a problem. On some units the gas pressure switch is on the same circut. This would be the NT LN model. On this one gheck to be sure your gas is on and bled out first. If this is a LP heater be sure you have enough gas to run it. Most heaters need at least 30% on the tank to get enough pressure to run the heater. If it is the air pressure than you need to check your air flow. Be sure to check you don't have bird or rat nests in your exaust or on the burner tray assembly. If you don't have any of these problems you may need a new air sensor. I hope I have helped.

Posted on Dec 20, 2009

  • 44 Answers

SOURCE: my wife said the pump timed off and the heater was

The fan will continue to run for a few minutes after the pump turns off to purge exhaust gasses.If it was still heating you have a problem. To reset the heater,turn off the pump breaker for 30 seconds. After that you need a repairman.

Posted on Sep 28, 2010

  • 1 Answer

SOURCE: master temp 400 with E05 error message, already replaced stack flue sensor, thermistor, and igniter. Any suggestions?

I have had the same problem with my '400' since it was new. I contacted the manufacturer and got the run around. I have been trying to get this resolved and now, a year and a half later, have decided to buy a different heater. Anyone want to buy a hardly used Pentair 400? sandtrap699@yahoo.com

Posted on Sep 23, 2013

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How old is the thermostat? Also there a limit switches at different points on that unit. If you have a volt ohm meter find the round disc like safety's and ohm them out. Take the wires off the disc before testing them. You should have a continuity should be closed they only open if unit gets too hot. Say something like 180 degree's.

A fast way to check out the thermostat is take a small diameter wire take the cover off the t-stat and jump across the R and the W on the t-stat. If the furnace comes on then t-stat bad. Let me know if this is helpfull. Ken

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The heater will not ignite properly and the heater will not shut off


Judging by your pics (helpful, by the way) you have a high limit wired into your thermostat wire. Try disconnecting that wire nut connection in front of your valve and hooking the thermostat straight to the top and bottom posts on the valve (eliminating the high limit). If it runs fine, either the connection was poor or your high limit wire is pinched.

Feb 28, 2008 | Cozy (W352E) Heater

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