Carbon monoxide alarm, possible cracked heat exchanger, should be completely sealed inside to outside.
Carbon monoxide, odorless, colourless, the SILENT Killer, (except for your CO detector},
New furnace or heat exchanger, If you can find just the heat exchanger, by the time/labour it takes to change it, it might be close to the price of a new furnace. Plus with a new furnace, you will also get all new parts, blower, circuit control board.
Two years ago in the house the furnace quit working. I was a cracked heat exchanger and fortunately, the furnace had a built in CO detector system that automatically shut it down. Exchanger and installation were about 3000 on a $3500 furnace.
Ken
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