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Thread: Pentair MasterTemp 250 Heater Natural Gas 460732

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    Pentair MasterTemp 250 Heater Natural Gas 460732

    Hello,

    Long time lurker, first time poster.

    I have a MasterTemp 250 NGas heater that's been giving me some headaches lately. Last year prior to closing it was 'bumping' and rattling. This spring I've replaced the thermal regulator and the manifold bypass valve (thanks to posts on this site). I believe the 'bumping' is gone, however, there still appears to be some rattling. I had the heater on today, but at some point it quit heating but it kept running. I noticed the 'heating' light was flashing. I also noticed the 'AFS' light briefly came on once but did not stay on, nor did I see it a second time.

    To me the rattling seems to be coming from the 'combination gas control valve'. There appears to be a switch on the side closest the opening with 2 wires going to it, maybe a breaker of some type, this seems to float back and forth. The part is attached along with red arrow pointing to switch I am speaking about.



    Any insight?


    Thanks,
    Bruce
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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    That's just a connection point the gas valve maker uses. It's that load you can hear it with the case on?
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Yes, you can hear it with all panels on and from a 15ft distance. I suppose it could be something else causing the rattling/clicking. However, it is not as loud by the front access panel as it is at the back panel with both panels removed.

    Bruce

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    I would get a gas person out and have them check to make sure your pressures are right. Not sure why the AFS light would come on unless there is an issue with the blower motor or the air tubes.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Any insights on why the valve seems to rattle?

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Any number of reason. Gas pressure to high or bearings in motor causing heater to rattle, etc.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Thanks for your feedback Paul!

    Is it a typical symptom of the valve to rattle?

    Do you think I'm barking up the wrong tree and the rattle I hear is not on the valve but elsewhere?

    I should mention the rattle appears after the unit comes up to temp or at some point later - it does not happen at startup.

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Just a quick note. I looked into the blower and saw some insulation. I pulled it out, noticed a turd, so i unscrewed the star nuts and took the cover off to pull the remainder of insulation out and make sure it was clean. I removed the top of the unit to look down into the hole the fan feeds into. There is yellow insulation in there. Before I pull it out I'm trying to understand if this is supposed to be there?

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Well I pulled the insulation out. Does not feel like it should be there. However, there appears more down in there.

    Looking for additional comments/tips.

    Should I pull the blower assembly off or should I just put a shop vac on it instead. How far down can the insulation be?

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Yes there is insulation inside the unit. Do not pull it out.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    It feels like the blower feeds into the flameholder assembly - which in the images appears like a cup. This should be filled with insulation?

    Amazon.com: Pentair 460746 Burner System Flame Holder Replacement Kit MasterTemp 250 Pool and Spa Heater: Patio, Lawn Garden

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Was it loose and fluffy. I am suspecting a rodent nest. pictures at this point would be good.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Yes it looked like typical yellow house insulation.

    Here's a picture of where i found it. This is a picture of my blower with the face off looking down into the combustion chamber.

    20150606_113014.jpg
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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    On the bottom of the MaterTemps is usually a pad of insulation of which the can sits on. Do you see it on the bottom between the can and the plastic bottom enclosure?
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Hi btu. I've worked on the Master Temp and it's predecessor the Maxi Therm. There should be no insulation down in the ignition chamber itself. There is a gasket that the blower sits on but it is white. The calling card of rats and mice is yellow insulation from usually house attics. That being said, I've only seen insulation and debris once down in the combustion cone. It took forever to figure it out. Basically the plastic vent cover over the blower intake was broken so that's how they got in. I shop vacuumed it out.

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    Re: Pentair MasterTemp 250 Heater Natural Gas 460732

    Sorry for the late reply and follow-up.

    First thanks for the replies and help.

    OldPoolMan I pulled all the insulation out, however, there still appeared to be some grunge down there so I pulled the blower off entirely. I then removed the cone, it looked like a lint trap so I cleaned off with an old tooth brush and shop vac and air. With the blower off I was able to vac out the chamber much better too. I put it all back together and the heater works much better, it's heating much quicker and no longer popping.

    It did have the plastic guard in place to keep mice out however the center hole looks big enough to allow mice in, I bought some small wire mesh which I will cut to place around the plastic guard as extra protection to keep the mice out.


    Again thanks for all your help.

    Bruce

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