Riello Unsafe Combustion / CO Production

Furnace runs but carbon monoxide detector in home alarms

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

Blocked heat exchanger or flue, Severe sooting, Incorrect air/fuel ratio, Cracked heat exchanger leaking flue gases into air stream

How to Fix / Troubleshooting

Critical safety: Turn off the furnace immediately, evacuate occupants if CO levels are high, and ventilate the building. Do not operate the furnace until inspected.

Steps (for professionals only):

Inspect flue and heat exchanger: Check for blockages, heavy soot, or cracks.
Perform combustion analysis: Adjust burner settings or condemn unsafe equipment as needed.

This condition requires immediate attention from a licensed heating professional.

Repair Difficulty

Professional Required 5/5