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oil burner won't fire

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edracer
edracer Member Posts: 9
Hi, I just replaced my tankless bypassed aquastat l8124a with a new l8148e. circulators come on, burner won't fire. Power to B1 & B2 connections is good, what's going on?

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  • newagedawn
    newagedawn Member Posts: 586
    edited November 2017
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    see if you have power to the primary black wire, if so then primary is bad, power in no power out of the control
    "The bitter taste of a poor install lasts far longer than the JOY of the lowest price"
    Solid_Fuel_Man
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
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    I assume the TT is jumped on you primary still?
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    Ummm isn't an L8148E for gas? 24v to burner circuit and you need 120v.
    https://customer.honeywell.com/resources/Techlit/TechLitDocuments/60-0000s/60-2278.pdf

    There was an error rendering this rich post.

    HVACNUT
  • edracer
    edracer Member Posts: 9
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    Shows 28 acv when checking at b1 & b2
    Not sure what jumping the tt means?
  • edracer
    edracer Member Posts: 9
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    Looks like 28 in the control as well?
  • edracer
    edracer Member Posts: 9
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    Idk plumbing supply place sold it to me?
  • edracer
    edracer Member Posts: 9
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    Thanks STEVEusaPA, that was the problem! They sold me wrong one. New one in, three heat is on!! Thanks all
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    You got lucky it wasn't the other way around, sending 120 to a gas valve.

    There was an error rendering this rich post.

  • neilc
    neilc Member Posts: 2,707
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    /\
    how bad could that have gotten?
    cook the gas valve ?
    or bigger kaboom ?
    known to beat dead horses
  • Leon82
    Leon82 Member Posts: 684
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    Unfortunately you have to double check even at a plumbing store.

    I saw the owner tell his worker to get a natural gas water heater. And then told him he would be fired if he brought a propane unit. So how many times has he messed that up.
  • edracer
    edracer Member Posts: 9
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    another question for you guys. upstairs thermostat calling for heat. circulator comes on, oil burner doesn't fire. only fires when downstairs thermostat is calling for heat?
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    Could be wired wrong, or could simply be the boiler is up to the high limit, and the aquastat is holding off firing the burner.
    Can you post a sketch on how you have it wired?

    There was an error rendering this rich post.

  • edracer
    edracer Member Posts: 9
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    no changes to wiring, it used to work fine. there is a relay before the aquastat tstats, & line in come through it. boiler temp is below by 90 plus degrees?
  • Alan Welch
    Alan Welch Member Posts: 270
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    Do you have terminals zc and zr on the new control, we're they used on the old? 8124 and 8148 are different controls.
  • edracer
    edracer Member Posts: 9
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    No, all the same writes used on both.
    Alan Welch
  • HVACNUT
    HVACNUT Member Posts: 5,861
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    You went from an aquastat that maintains temp to a high limit only, cold start. The first floor zone is connected to TT in the aquastat so if fires to limit and runs that circ on a heat call. Nothing on the switching relay for the upstairs zone is telling the burner, "hey, I need heat. It will run the circ only. You need to utilize ZR,ZC. What model is the switching relay for the upstairs ?
  • edracer
    edracer Member Posts: 9
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    wires I meant to type wires!
  • Alan Welch
    Alan Welch Member Posts: 270
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    HVACNUT got what I didn't feel like typing. The supply house still didn't sell you what you needed. When you use a different control you have to know what the previous control strategy was, and what you have to do to compensate. Easier to just replace like with like.