Our 1 year old Goodman gas furnace ran fine last winter. Have only been using A/C this summer.
Now it short cycles so fast that the induction fan doesn't even get all the way up to speed. No blockage. Went on the roof and noticed that if I block the output, The fan will run forever. As soon as I remove my hand the fan shuts off. This seems backwards from the way the induction air proof switch should work. Any ideas ?
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