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Thread: Pentair heater not starting!

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    Pentair heater not starting!

    Howdy!

    Trying to heat the spa for the first time this year, and the heater will not start. I have a Pentair MiniMax and it doesn't (or didn't) get much use as I am in sunny Texas. The power light is illuminated, but none of the other lights are coming on (thermostat, heat, etc) when I use the control to try and start it. I have reset the power and cycled the gas valve on and off several times but can't get any other LED's to light.

    Any ideas would be appreciated, thanks!!!
    25k I G plaster pool w/spa. 2.2HP Century Centurion switchless motor. COMPOOL lx3800. Pentair FNS Plus DE FILTER 60sq/ft.
    Houston, TX - direct sunlight 8 hours a day.

  2. Back To Top    #2

    Join Date
    Dec 2012
    Location
    Manassas Park, VA
    Posts
    191

    Re: Pentair heater not starting!

    I have a Pentair MiniMax Plus 400. This is the one with the knobs (one for pool and one for spa) and 6 LED lights. Below is a link to the service manual that I have found online. On page 24 it has troubleshooting for when the Diagnostic Lights Show "Power Only".

    The way the unit works is that power must pass through one module first before passing to another. The first module it passes through is the T Stat, and since this light is not on it means that it could be an issue with the thermostat. So it could mean that your thermostat needs to be replaced. The manual states trying to use a jumper to by-pass the thermostat to see if this resolves the issue.

    http://www.rhtubs.com/manual/minimaxPlus.pdf
    25,000 gallon in ground white plaster- 1 1/2 HP Pentair SuperFlo pump - 60 sqft FNS DE filter (with FiberClear), 1999 Sundance Optima 850 hot tub.
    Manassas Park, VA

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    Re: Pentair heater not starting!

    Quote Originally Posted by Rocco View Post
    I have a Pentair MiniMax Plus 400. This is the one with the knobs (one for pool and one for spa) and 6 LED lights. Below is a link to the service manual that I have found online. On page 24 it has troubleshooting for when the Diagnostic Lights Show "Power Only".

    The way the unit works is that power must pass through one module first before passing to another. The first module it passes through is the T Stat, and since this light is not on it means that it could be an issue with the thermostat. So it could mean that your thermostat needs to be replaced. The manual states trying to use a jumper to by-pass the thermostat to see if this resolves the issue.

    http://www.rhtubs.com/manual/minimaxPlus.pdf
    Great, thanks.
    25k I G plaster pool w/spa. 2.2HP Century Centurion switchless motor. COMPOOL lx3800. Pentair FNS Plus DE FILTER 60sq/ft.
    Houston, TX - direct sunlight 8 hours a day.

  4. Back To Top    #4

    Re: Pentair heater not starting!

    My Pentair heater didn't start either... thank goodness it was under warranty. I have to say, they were prompt about fixing it tho!
    Helen
    Dallas Area, 16,000 gal IG, Easytouch 8 computer, Intelliflo 3HP Variable Speed pool pump, Pentair Smart Pump 4x160, Pentair 3/4 HP Booster Pump, FNS 60 DE 60, Mastertemp 400, Rainbow 320, Dual Timer w/ freeze protection, Intellichor SWG, TF100 Test Kit, POOL FILLED AUG 3, 2012, ORDER YOUR TF100 KIT FROM http://tftestkits.net
    http://www.troublefreepool.com/under...ie-t49936.html

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    Re: Pentair heater not starting!

    changed the thermistor but no luck.
    25k I G plaster pool w/spa. 2.2HP Century Centurion switchless motor. COMPOOL lx3800. Pentair FNS Plus DE FILTER 60sq/ft.
    Houston, TX - direct sunlight 8 hours a day.

  6. Back To Top    #6

    Re: Pentair heater not starting!

    I ordered a new potentiometer thermostat but now I am stuck finding the physical location of the thermostat. I've a feeling this may be a newer part for a newer circuit board. Can somebody direct me to where the thermostat is located, please? Thanks.
    25k I G plaster pool w/spa. 2.2HP Century Centurion switchless motor. COMPOOL lx3800. Pentair FNS Plus DE FILTER 60sq/ft.
    Houston, TX - direct sunlight 8 hours a day.

  7. Back To Top    #7

    Join Date
    Dec 2012
    Location
    Manassas Park, VA
    Posts
    191

    Re: Pentair heater not starting!

    Charlie,

    Below is a link that shows the parts of the heater. It is showing the potentiometer as number 26. Looks fairly easy to access.

    http://www.spapartsshop.com/PentairP...00Heaters.aspx
    25,000 gallon in ground white plaster- 1 1/2 HP Pentair SuperFlo pump - 60 sqft FNS DE filter (with FiberClear), 1999 Sundance Optima 850 hot tub.
    Manassas Park, VA

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    Re: Pentair heater not starting!

    Thanks Rocco. So I figured out on my model the potentiometer is part of the circuit board.

    So I've replaced the circuit board, found it for $65 on Amazon Warehouse deals as a return and I have PROGRESS.

    The thermostat now works and all the LED's come on and the heater TRIES to start but now there is just a clicking of the pilot trying to light and the red service light comes on....

    So this must be a supply or ignition issue? It hasn't been started in about seven months....

    Any

    Thanks guys! Hoping to be in the spa tomorrow night!
    25k I G plaster pool w/spa. 2.2HP Century Centurion switchless motor. COMPOOL lx3800. Pentair FNS Plus DE FILTER 60sq/ft.
    Houston, TX - direct sunlight 8 hours a day.

  9. Back To Top    #9

    Re: Pentair heater not starting!

    F I X E D

    I changed the circuit board ($65 from amazon) and the pressure switch ($40 from amazon) and the heater is firing.

    Took me a while and a few trips to return the wrong parts, but saved me a bunch over paying a tech to do it.

    Thanks guys!
    25k I G plaster pool w/spa. 2.2HP Century Centurion switchless motor. COMPOOL lx3800. Pentair FNS Plus DE FILTER 60sq/ft.
    Houston, TX - direct sunlight 8 hours a day.

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