Heil Combustion / Venting Hazard

Furnace runs but carbon monoxide detector in the home alarms during operation.

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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.

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Possible Causes

Cracked heat exchanger, Blocked flue, Improper combustion air supply, Backdrafting due to negative house pressure

How to Fix / Troubleshooting

Emergency safety: If a CO detector alarms, immediately turn off the Heil furnace, ventilate the home, and evacuate if levels are high. Do not operate the furnace again until it is inspected.

Steps:

  • Shut down equipment: Turn off furnace power and gas supply.
  • Ventilate: Open windows and doors to allow fresh air in.
  • Do not attempt DIY repair: Heat exchanger and combustion diagnostics require specialized tools.

When to call a pro: Contact a licensed HVAC technician and, if necessary, the gas utility. The technician must inspect the heat exchanger, venting, and combustion and may need to replace the furnace if the heat exchanger is cracked.

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Repair Difficulty

Professional Required 5/5

Required Part

Heat Exchanger
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