Your furnace’s heat exchanger is one of its most important and most expensive components. It is the part responsible for transferring heat from the combustion chamber to the air that circulates through your home. But when a heat exchanger develops a crack, it is more than just a costly repair. It is a serious safety hazard. LV Heating & Cooling would like to share how to recognize the warning signs of a cracked heat exchanger and what steps to take next.
Why a Cracked Heat Exchanger is Dangerous
A cracked heat exchanger can allow carbon monoxide (CO) to leak out as well as other harmful combustion gases into your home’s air supply. Because carbon monoxide is colorless, odorless, and potentially deadly, catching the problem early is essential for protecting your family.
Common Signs of a Cracked Heat Exchanger
Unusual Furnace Smells: A strong, constant odor that smells like formaldehyde or chemicals can indicate a crack. This smell often irritates the eyes or nose and should never be ignored.
Soot or Corrosion Around the Furnace: If you see black soot, scorch marks, or rust on or around your furnace, it may be a sign of incomplete combustion and a compromised heat exchanger.
Water on the Floor: Condensation inside the furnace can sometimes point to internal issues, including cracks. While water can be from other causes, combined with other signs it can be a red flag.
Visible Cracks or Damage: If a technician removes the access panel and you can actually see cracks in the heat exchanger, the unit should be shut off immediately.
Frequent Headaches or Nausea: Carbon monoxide exposure from a cracked exchanger may cause headaches, dizziness, nausea, or flu-like symptoms among household members. If you suspect CO, leave your home and call emergency services.
Tripped Carbon Monoxide Alarm: If your CO detector goes off near the furnace area, it could be caused by a cracked heat exchanger leaking dangerous gases.
What to Do If You Suspect a Crack
Turn Off the Furnace Immediately: Shut down your heating system at the thermostat and breaker to stop any further leaks.
Leave the Home if Necessary: If you suspect carbon monoxide exposure due to headaches, dizziness, or your alarm is sounding, get everyone out of the home and call emergency services.
Call a Licensed HVAC Technician: Only a professional can confirm a cracked heat exchanger through inspection. They will run tests and use specialized equipment to confirm the issue.
Do Not Attempt DIY Repairs: A heat exchanger cannot be safely repaired by homeowners. Cracks typically require either replacing the exchanger itself if under warranty or installing a new furnace.
Heating Inspections, Tune Ups, Repair, Replacement & More in Summerlin, North LV, Henderson, Enterprise, Paradise, Spring Valley, Sunrise Manor & Greater Las Vegas, NV
A cracked heat exchanger is a serious problem you can’t afford to ignore. Knowing the signs of unusual smells, soot buildup, carbon monoxide alarms, or health symptoms can protect your family from danger. If you suspect your furnace has a cracked heat exchanger, shut it down and call LV Heating & Cooling today.
