Cracked Heat Exchanger

Common Symptoms

Carbon monoxide detector alarming

Soot around furnace

Yellow or flickering burner flame

Strong odor when furnace runs

Family experiencing headaches, nausea (CO poisoning symptoms)

Visible cracks during inspection

Several factors can contribute to this problem. Understanding the cause helps determine the right solution.

1Age and thermal stress (normal wear)

2Overheating from restricted airflow

3Improper sizing

4Poor maintenance history

5Manufacturing defect

Before calling a technician, try these simple checks that may resolve the issue.

Install CO detectors if not present

Look for soot around furnace

Observe burner flame color (should be blue)

Note any unusual smells

Watch for CO detector alerts

CO detector alarming (evacuate first)

Any suspected heat exchanger issue

Furnace is over 15 years old

Symptoms of CO poisoning

During regular maintenance inspection

Experiencing any of these situations?

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