Visible rust or water stains on or around the heat exchanger area
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Safety: Turn off power and gas. A compromised heat exchanger can leak combustion gases into the air stream.
- Do not operate: If you suspect a cracked heat exchanger, do not use the furnace.
- Visual inspection: Look for heavy rust flakes, holes, or cracks in accessible parts of the heat exchanger.
Only a qualified technician can properly test and confirm heat exchanger integrity. Replacement of the heat exchanger or furnace may be required.
Repair Difficulty
Required Part
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