Furnace problems
Went to turn on the furnace for the first time this year and the fan came on but just cold air, no heat, it seems like it couldn't ignite. The air coming out was cool and could get hot like it usually...
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I had the same issue and it turned out that the gas tube on the top of the furnace was corroded and some rust had fallen down and blocked the gas port. Had to remove the tube and clean it and clean up the rust on the gas valve.
