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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.
I can post a link to the install manual which shows diagrams of the proper condensate tubing routing for various positions. It's too complicated to try to explain here.
Then I don't know what I can add from here. I also have to assume the drain and drain tubing are not blocked. I'm going to open this backup to my colleagues maybe one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.
If its plumbed correctly, then the pan is leaking, or the unit so far out of level that the pan is overflowing on the end furthest from the drain.
A competent technician would have removed the coil access cover and inspected for that... if he didn't you certainly could.
Let me know what you find, we can go from there without a time limit.
Thanks, ***** ***** was correct in that case, I had only the *cooling coil condensate* issue in mind, not the condensate drain on a condensing furnace.
see page 42, send me a photo of that area please so i can see both condensate drains and the related piping. I may need to see a few photos of the same area with the service panel removed from the area over the furnace condensate drain as well...
We can go from there.