6 Signs That Your Furnace’s Heat Exchanger Is Bad
Worried your furnace’s heat exchanger is cracked or failing? The six warning signs are: (1) your carbon monoxide detector goes off, (2) a strong chemical smell (like formaldehyde) from the furnace or vents, (3) rattling, banging, or popping sounds when it runs, (4) white soot buildup or discoloration on the heat exchanger or burners, (5) yellow or orange burner flames instead of steady blue, and (6) little or no heat. Because a cracked heat exchanger can leak deadly carbon monoxide, this is the most serious furnace problem there is. If your CO detector sounds, leave the house immediately and call
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