Furnace Cycling - SOLUTION w/ Pictures
EDIT: This turned out to be an air flow issue. The solution was quite simple. The furnace has three knockouts on the back when using flexible vent duct adapted to hard in-floor ducting. Crossroads has...
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Ours acted similar. It turned out that it was installed improperly and allowed the heated air to return immediately to the inlet side of the blower. This caused an overtemp condition after a few minutes (and low airflow out of the vents). It took me a year to figure it out as it looked just like a restricted air flow problem.
