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Bang at start up pentair heater - Pentair Pool & Spa

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  • Pentair Master
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What kind of bang, like an explosion? if so, then a burner orifice or more than one orifice or the burners, are plugged. What is happening, raw fuel is not reaching hot surface igniter quick enough. The raw fuel then collects from a further orifice, and by the time that it reaches the hot surface igniter, there's a little bit too much fuel, and there is an explosion. Which is not normal. You need to clean the orifices and the main burners.

Posted on Apr 05, 2015

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Posted on Jan 02, 2017

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SOURCE: Pentair Minimax NT Heater, this AM, come on with a

Rat nests inside the fire box or cloggs in the gas orface's going to the burners. Quite often this could be small spider webs that will look like lint.
If you have something keeping the gas from getting to the ignitor or the pilot instead of getting a smooth ignition the gas will build untill it reaches the ignition source, then boom. This will esaust all the oxigen and it will shut the heater down till it cycles again.
Hope this helps.

Posted on Feb 06, 2010

Testimonial: "Thank you, I have a technitian coming Monday. Fooling with gas is for experts only! Thanks for advice. Dave"

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After my heater fires I hear a loud bang a see flames shooting out the blower. The heater keeps working but happens every time it starts up. why?


Sounds like something happened with gas pressure?
Way high?
Absolutely, call somebody / a tech that knows how to test for gas pressures using a Manometer. Your Gas provider, should have a tech service dept.

Jun 18, 2015 | Pentair Mastertemp Heater

1 Answer

Have a Mastertemp 250, heard a bang, then water started leaking out of exaust. What could the problem be?


25620249-iwrnrkacomuoeuyhvucmvd0t-2-0_0.gif That is a diagram of the components of your heater.
Item #1 the Heat Coil or to be more precise, the Heat tube Sheet Coil Assembly Kit had BURST.
That is found within the tightly enclosed round chamber with the tightened securing screws on top and completely sealed with the Red Silicone sealant. Water is only to be in that coil assembly. When you heard the loud pop, it ruptured and water is now in the round chamber, which is a the Heat Chamber! Hot air exits that thru the exhaust, but you have water exiting now.

You can replace it yourself... it is a rather tedious job and laborious, but if your up to it, I think you may be able to do???
If not, call a service professional, preferably a Certified Pentair Tech, experienced in MasterTemp Tube Coil replacement.

I will include some pictures of the last one I performed a Heat Coil Replacement. If you choose to do it yourself, ensure that when you order a replacement kit, that it has a tube of High Heat/Temperature Silicone Sealant, the RED stuff. You will also need to know the date of manufacture of your specific heater!!! The kit changed back on January 12, 2009...
Pre that change date part # 460747
After that date, # 474059

Good Luck


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Mar 31, 2015 | Pentair Mastertemp 460732 250000 Btu Gas...

1 Answer

How do you start pentair 400


Was this heater just put in? First step is to turn on the filter pump, then turn on the heater by pushing either pool or spa, then set temperature. If this doesnt work then come back and let me know what the heater is doing.

Jul 31, 2014 | Pentair Pool & Spa

1 Answer

I have a 8 year old pentair minimax 200ch that does not start but pilot liights up


all these heaters have safety features that must test 'ok' before they will light. the first place to start is the pressure switch. if it doesnt sense water flow, you will not have heat

Jun 28, 2014 | Pentair Minimax NT Heater

2 Answers

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

May 14, 2014 | Pentair Minimax NT Heater

2 Answers

Water leaking from the air blower


This sounds suspiciously like a leak in the heat exchanger. The heater will have to disassembled and inspected for a leak in the drum assembly where the heat exchanger is located. This is where the water is likely coming from.

Aug 08, 2012 | Pentair Mastertemp 460732 250000 Btu Gas...

1 Answer

Pentair Minimax NT Heater, this AM, come on with a bang, blowing the metal cover off the cabinet. Possible problem{s}? Dave


Rat nests inside the fire box or cloggs in the gas orface's going to the burners. Quite often this could be small spider webs that will look like lint.
If you have something keeping the gas from getting to the ignitor or the pilot instead of getting a smooth ignition the gas will build untill it reaches the ignition source, then boom. This will esaust all the oxigen and it will shut the heater down till it cycles again.
Hope this helps.

Feb 05, 2010 | Pentair Minimax NT Heater

1 Answer

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


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

Apr 16, 2009 | Pentair Minimax NT Heater

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