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Your furnace has an “over heat” sensor and will shut down if too much heat builds up in the plenum. Sounds like that’s what happened on your case. There might be some blockage in the other ducting, air will take the path of least resistance.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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