Lennox Furnace drain issue

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Any factory photo that shows it *inside* the cabinet will do....
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Its not inside the furnace, its a factory supplied trap that is mounted on the outside of the furnace on the cabinet. Its not a field fabricated trap like noonie was eluding to.
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Exactly, now are we sure the installers installed this part? Nope!
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Yes.
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I did switch the hoses around on the trap a couple days back and it made no difference.
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I didn't figure it would
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wrote:

What's your idea of what may be wrong.
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With a level furnace, proper "clean" trap, no other secondary line trap... I would look towards a venting hose issue.
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Like you say it drains when it shuts off so nothing is blocked. Whatever the problem is I hope the OP lets us know what the outcome is.
Maybe there is something internal in the furnace that's wacked.
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No, it wasn't the lowest bid I received, and in fact, a relative used the same company a few year earlier and has not had any problems. That said, I do think that company is clueless about the actuallworkings of a furnance, they were more focused on an installation.
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snipped-for-privacy@gmail.com wrote:

Usually the furnace companies hold a class on each of their new systems. Sadly many Techs neglect to attend them.
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Find someone who's competent?
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