Question about Pentair Minimax NT Heater

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My pool heater will not start. The power light is off and the pressure sw is lit.

I have a pentair mini max nt propane pool/spa heater which will not start. The power light is off and the pressure sw is lit.

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You must turn on the pump and let water circulate through the pool and the heater before you turn on the heater otherwise you will ruin the heater

Posted on Apr 16, 2009

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Pentair Mini max my power light comes on but my pressure sw does not light up


if pressure switch does not light that means no pressure either water flow or a bad pressure switch you can jump the wires on the pressure switch but be very carefull if it does start make sure it does not bang or make noises

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Mini max my power light comes on but my pressure sw does not light up


Try cleaning the filter, or check the water flow. It's sensing not enough water flow through your system.

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Why does my pressure light not come on on my mini max pool heater


Sensing not enough water flow, most common problem, dirty filter.

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if connected to control make sure heat is enabled

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Start at the begining, make sure you have power going to the heater and check to see if it is 110 or 220v. If you have power and it is correct the next stop is your transformer and how it it wired. You should have a diagram inside the main power junction box for the heater. If you have good power in to the transformer and 24v coming out it will be in your safty circut. Roll out switch and pressure switch are good places to start. The main power or transformer are probally where you should look.

May 09, 2010 | Pentair Minimax NT Heater

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What does error EO4 mean on a NT Mini Max Propane heater?


This is a fan falure code, it will mean your fan is out or the air pressure switch has a problem. Ether in the switch or the hose going to it. You can also check where the hose hooks up to the fan housing to see if anything is stuck in the port.

Feb 14, 2010 | Pentair Minimax NT Heater

1 Answer

My pool heaters starts to hum and the service light comes on


millivolt heaters generate their own power from the flame on the pilot max is usualy 750 millivolt, check all connections clean and secure.
Mmake sure the pilot is lit

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hello. i can help. if you have propane but you can not get the pilot to light your thermocouple needs to be replaced. this is a common item available at any hardware store.

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check pressure switch for proper adjustment and make sure filter is clean so system pressure is normal

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