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Have a Pentair MiniMax NT 6800 Low NOx heater that will not light

I have a Pentair MiniMax NT 6800 Low NOx heater that will not light. I havent attempted to start if for about a year. On the outside panel, the Power Light, TSTAT light, Aux light, Press light, Power Light and Service light are on; (not the Heat Light). On the back of the panel the the HTemp light and Tfuse Light are on, but not the PV light. The fan is blowing the entire time but never seems to attempt to light. Any suggestions?

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Posted on Jan 02, 2017

  • 15 Answers

SOURCE: Pentair Minimax NT 400 heater. fan keeps coming

Sounds like the controller is the problem. This is the circuit board that has the display and controls on it. You can swing that panel open and try tapping on the white plastic cover the controller is under that. This might get the fan relay to release but you will have to replace the controller it will stick again

Posted on Jun 23, 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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