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Oh well. Had to try. Thanks for the help anyway

Thanks. I did so. The 31 LED code says " pressure; draft safeguard; auxiliary-limit (when used); or blocked vent shutoff (when used) switch did not close or reopened. I have no idea what that means

I have an 9 year old carrier weathermaker 9200 gas furnace. I'm getting no heat from the downstairs unit. The upstairs unit is working fine. I took the cover off, and I can see the black electric...