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  1. #1
    Join Date
    Feb 2014
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    12
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    Short spark ignition trial time. does not ignite. New board.

    Hey there fellow techs. I had a service call on a package gas electric Lennox rooftop unit.

    The problem is following:

    Call for heat from EcoBee thermostat.

    Inducer goes on. spark starts but only for half a second and shuts off. it tries like that several times.

    After several tries the spark stays for about 4 or 5 seconds and the burners then ignite.

    once lit, no problems.

    So the Q is why does it stop sparking immediately after 0.5 sec?

    I replaced the board already and the same thing.

  2. #2
    Join Date
    Aug 2016
    Location
    PA USA
    Posts
    42
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    I'd be looking real hard at the spark wire and electrode.

  3. #3
    Join Date
    Aug 2015
    Location
    Buffalo,NY
    Posts
    1,033
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    Quote Originally Posted by Blake79 View Post
    I'd be looking real hard at the spark wire and electrode.
    And grounds


    Sent from my iPhone using Tapatalk

  4. #4
    Join Date
    Dec 2018
    Posts
    2
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    Sounds like a spark intermittent issue.

  5. #5
    Join Date
    Jul 2018
    Location
    Wisconsin
    Posts
    1,103
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    Quote Originally Posted by Metalman0880 View Post
    And grounds


    Sent from my iPhone using Tapatalk
    And gap

    Sent from my SM-G960U using Tapatalk

  6. #6
    Join Date
    Mar 2015
    Location
    Hamersville, Ohio
    Posts
    7,281
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    All of the Above.
    Hos 4:6 My people are destroyed for lack of knowledge. Because you have rejected knowledge, I will also reject you, that you may be no priest to me. Because you have forgotten your God’s law, I will also forget your children.


    "You've got to Stand for Something or You'll fall for anything" (A. Tippin)


    Mat_15:24 But he answered, “I wasn’t sent to anyone but the lost sheep of the house of Israel.”

  7. #7
    Join Date
    Feb 2014
    Posts
    12
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    Thread Starter
    I looked for ground problems and made sure the ground wire from the board is nice and tight.
    Also looked at the spark rod, wire, for breaks and flaws and did not see any.

    but how will that shorten the spark time. how does that effect the timer?

    Thank You all, fellas, for taking the time!

  8. #8
    Join Date
    Sep 2016
    Location
    Saint Augustine, Florida
    Posts
    54
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    Have you tried a quick field test out of the unit with necessary components. Ignition modules operate at high high voltages and of course low currents. Even small anomalies in the ceramic around the rod can affect the performance.

  9. #9
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    32,174
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    Model and serial of the unit?

    Can you post a pic of the board you replaced?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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  10. #10
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    10,720
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    Did you make sure you are not getting a pressure switch flutter dropping out the board for an instant.

    Why did you replace the board? What fault did you observe with it? Did you check any voltages, amps on the inducer, anything?

  11. #11
    Join Date
    Mar 2018
    Location
    Kansas Flatlands
    Posts
    436
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    Quote Originally Posted by BNME8EZ View Post
    Did you make sure you are not getting a pressure switch flutter dropping out the board for an instant.

    Why did you replace the board? What fault did you observe with it? Did you check any voltages, amps on the inducer, anything?
    Bingo!! Maybe it's just me, but over the years it seems I've had wire spade connection issues on Lennox equipment. Limits and pressure switches causing various mess with your mind issues wind up being a connection.

  12. #12
    Join Date
    Aug 2016
    Location
    PA USA
    Posts
    42
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    I would also look hard at the gas valve. Disconnect valve from circuit and see if spark stays consistent. Had a few lennox rooftop units valves causing same issues.

  13. #13
    Join Date
    Dec 2007
    Location
    north suburbs of Chicago
    Posts
    1,699
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    Quote Originally Posted by theoldscroll View Post
    Bingo!! Maybe it's just me, but over the years it seems I've had wire spade connection issues on Lennox equipment. Limits and pressure switches causing various mess with your mind issues wind up being a connection.
    Six freaking trips on an Amana unit till the pressure switch FINALLY started to act up while I was there.

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