Ruud Combustion or Venting Problem Producing CO

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

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

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

How to Fix / Troubleshooting

Critical safety: If a CO detector alarms, immediately turn off the furnace, open windows, evacuate if levels are high, and call emergency services or the gas company. Do not use the furnace until it is inspected.

Steps:

Shut down furnace: Turn off power and gas to the furnace.
Ventilate: Open doors and windows to dilute CO.
Do not restart: Do not attempt to restart the furnace until a qualified technician has inspected the heat exchanger, burners, and venting system.

Repair Difficulty

Professional Required 5/5

Required Part

Heat Exchanger

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