This may belong in wall of shame. Installed a furnace yesterday and got a recall today, it was shutting off on the high limit. Duct work was fine supply and return 100 cfm short both sides not enough to poppin limit in under 2mins, even opening electronic air cleaner and pulling coil panel off.
Should have figured it out here, but was fixated on over sized flue. I do that a lot get something in my head and fixate? not word I'm looking for...
Anyways, after wasting a bunch of time and having to call my boss to help me. He had to call Trane soon as he gave them model/serial they knew what it was.
For some reason they put baffles across the entire heat exchanger!!! Boss noticed that after looking at it but they have DO NOT REMOVE stamped on them.
Had to take pics of it and removing/moving baffles unit tag don't have those my coworker's phone takes much better pics then mine. But thought I'd post this cause it certainly caused me a headache and maybe will save someone else one. Never had this problem before, looking back I should've figured it out quicker but I didin't. Maybe just 100k units I don't know.
And a side note...probably get flamed for this. The limit was 120 thought that was to small didn't have any at shop and parts house only had 160 and up so put that in. Not quite the same as Trane's limits. Should've looked at that Trane's are a little narrower. Didn't touch the edges of the insertion hole but close enough to arc which popped the fuse and caused more frustration.
Hope you had a better day than me:-)