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LP boiler Shuts off completely after reaching room temp

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JstKeith
JstKeith Member Posts: 7
edited November 14 in Strictly Steam

I have a burham p-204-w lp boiler(1983) that shuts off completely after it reaches operating temperature. No pilot, nothing. Relight the pilot And receives call to heat, fires up, water circulates, room reaches temp and then shuts off completely again. Called service and replaced the gas valve. Worked for a day then same result. Service guy stumped. Hearing it could be the aquastat. The Honeywell L8148E 1166 is no longer available(old). So I'm looking for a solid replacement for this aquastat. Photo Attached.

Thanks for any direction

1000043521.jpg
mattmia2

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,172

    I wouldn't replace it by shooting the parts cannon. What happens if you replace it and that doesn't fix it? If you have a standing pilot you have to light with a match or lighter, do you??

    If you do I doubt the aqua stat is your problem. Post some pictures you probably have a bad thermocouple. The pilot once lit should stay lit

    mattmia2
  • mattmia2
    mattmia2 Member Posts: 15,067

    or a problem with the gas pressure or a problem with the burner being clogged or positioning or maybe a draft problem. the gas valve would be near the bottom of my list.

  • JstKeith
    JstKeith Member Posts: 7

    Gas pressure is good adjusted to optimal pressure. Replaced thermocouple . Pilot stays on. System only shuts off completely after reaching opperating (180°) temp. Watched service tech adjust manifold to 10psi and helped call out the numbers for gas supply pressure, set at 12. Pilot has good color. Burners have good color. Head scratcher.

    20190728_170316.jpg
  • JstKeith
    JstKeith Member Posts: 7

    I Light the pilot with a flame.

  • mattmia2
    mattmia2 Member Posts: 15,067

    i'm not talking about the regulator settings, i'm talking about what actually happens to the pressure especially on he input side dynamically as the burner and other appliances turn on and off and especially if it is lp after it has been drawing down the tank for a while.

  • mattmia2
    mattmia2 Member Posts: 15,067
    edited November 14

    can you show a picture of the gas train? is it a combination valve or separate components?

    er, i guess if it is 1983 it is a combination valve. some of that wiring looked much older.

  • JstKeith
    JstKeith Member Posts: 7
    1000043517.jpg 20190919_171114.jpg 1000043566.jpg

    Pressure while opperating was steady around 10.2 no real fluctuations

  • mattmia2
    mattmia2 Member Posts: 15,067

    did anyone pull out the burners and clean them? it looks like that needs to be done regardless

    reggiGGross
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,172

    Do you have any other appliances running propane? Any problems with those? With propane you have a reg at the tank and one outside the house. I would check the vent connections on those regs for dirt spiders etc. If the reg can't breathe it cant regulate.

    Also, don't know how cold it has been where you live but you could have a little moisture inside one of the outdoor regulators that can freeze and make the regulator stick

  • JstKeith
    JstKeith Member Posts: 7

    Picture of front of furnace is with the old valve. New vavle is what

    they replaced it with Pulled all tubes and cleaned them.

    I have a water heater and stove that both work fine.

    20190919_171114.jpg 1000043566.jpg
  • JstKeith
    JstKeith Member Posts: 7
    1000043572.jpg 1000043569.jpg

    So I guess it was as simple as checking water level in the system. It was just low enough that Aquastat reaching high temp limit and safety shutting off the system. Heat has stayed on for a couple days now. "Praise Jesus".

    Thanks for your insight

  • ratio
    ratio Member Posts: 4,164

    Something is still not right. That is a standing pilot gas valve, there is no connection between the pilot and the controls. There's no way for the aquastat to kill the pilot flame.

    mattmia2OreoCat
  • JstKeith
    JstKeith Member Posts: 7

    Thanks for the input, I'm at a loss because it's still working. The best view I can give you to the electric side of things

    1000043517.jpg

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