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Old 04-11-2009, 09:38 PM   #16
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Lennox furnace.help


Okay, so the spark and gas at the same time should stay on for
a couple of seconds. So if system arcs for a half second and then gas sprays is it most likely because board not allowing
spark signal long enough? This has been going on for months with technicians coming over trying to fix and usually it never
happened whenn they were here. Now when it happens all the time i cannot find anyone. Can you tell me please when board sends signal through spark wire to ignitor how can i test to
verify either wire, board and something else is wrong.

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Old 04-11-2009, 09:48 PM   #17
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I have already tested wire and test ok. If it sparks erracticly and sometimes half second sometimes more is it the control
board. Sorry for the terms used i work on cars with some what
same devices, but completely different terms.
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Old 04-11-2009, 09:55 PM   #18
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I haven't seen it but the way you are describing If you aren't loosing spark through the wire or a short at the ignitor.. My best gusss from here is the board
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Old 04-12-2009, 12:54 PM   #19
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The board has a high voltage ignition transformer and it is weak/faulty and the board needs replacing and sometimes the ignition wire,as like a spark plug wire they deteriorate. May look good but can leak to ground. The gap between the igniter rods should be about 1/8" to 1/4" (use a drill bit) and you should remove the burners and clean the deposits off the ends of them and blow them out with air. This is a very similar unit:http://tech.lennoxintl.com/PDFs/9723d.pdf. The manual for yours doesn't show the igniter well.

Last edited by yuri; 04-12-2009 at 01:18 PM.
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Old 04-12-2009, 04:08 PM   #20
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yuri, Don't see many lennox around here.. Was it a safe guess that it has/ had direct spark ign ? I know the goodman & some others had the spark transformer made to the board.wire runs from trans. on the board to the ignitor.... Is this 1 similar ?
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Old 04-12-2009, 08:48 PM   #21
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Yep. A few of the series #1 and 2 Lennox G24 and 80MGFs had direct spark ignition like the Rheems. Very popular and similar to the type used in rooftop units. The later series all have HSI. Download/check that link as it may be of use to you in the future. Has both systems in it.

Cheers

Last edited by yuri; 04-12-2009 at 09:00 PM.
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Old 04-13-2009, 09:21 AM   #22
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Thanks i appreciate the help from both of you. Also i appreciate
the manual it showed that ignitor and gas should try for 7
seconds and the ignitor doesnt even get close too staying on
that long. Well now im gonna try to find one of these boards
thanks alot.

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