Payne
Flue Gas Spillage / Possible Heat Exchanger or Venting Problem
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, disconnected vent pipe, negative house pressure backdrafting flue gases, improper vent sizing
How to Fix / Troubleshooting
Safety first: This is a life-safety emergency. Turn off the furnace and all fuel-burning appliances immediately. Ventilate the home and evacuate if CO levels are high.
- Do not operate the furnace: Leave the furnace off until it has been inspected by a qualified HVAC technician.
- Inspect venting (visually only): Look for disconnected or collapsed vent pipes, but do not attempt major repairs yourself.
- Have heat exchanger inspected: A professional should perform a thorough inspection for cracks, holes, or corrosion.
- Service or replace equipment: If a cracked heat exchanger or serious venting defect is found, the furnace or vent system must be repaired or replaced before further use.
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Repair Difficulty
Professional Required
5/5
Required Part
Primary Heat Exchanger
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