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  1. #1
    Join Date
    Mar 2018
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    troubleshooting aquastat honeywell L8148E

    I have a boiler that does not fire. zone valves are calling for heat and flue damper is open but zero voltage to gas valve. If I turn main power off just for one second and back on the boiler fires immediately any suggestions other than replacing aquastat.
    Thank You Mark.

  2. #2
    Join Date
    Jun 2014
    Dover, DE
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    Mark, are you a technician or is this your boiler in your home?
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

  3. Likes DavidDeBord liked this post
  4. #3
    Join Date
    Jan 2012
    Broomall, PA
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    DIY is limited, but if you're a tech, you should grab your meter and work your way around that control-testing the terminals when it fails. It's either sending voltage to the gas valve or it is not.
    "Sometimes what's right is what's left after you do everything wrong"--Robin Williams

  5. Likes DavidDeBord liked this post
  6. #4
    Join Date
    Mar 2013
    Billington Heights, NY
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    usually boilers that have this setup also use an electronic control box for ignition and gas valve. If the power is cycled and it works it's usually NOT the aquastat or damper end switches. Judicious use and understanding of the VOM is very helpful in this case.
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"
    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

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