Protherm
Flue Gas Spillage / Incomplete Combustion
Furnace emits a chemical or exhaust‑like smell indoors
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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
Leaking flue joint on Protherm concentric flue, Blocked flue terminal, Cracked heat exchanger, Negative pressure in room drawing flue gases in
How to Fix / Troubleshooting
Safety first: Turn off power and gas immediately. Ventilate the area and do not use the furnace until inspected. Risk of carbon monoxide poisoning.
- Step 1 – Visual flue check: Inspect all accessible flue joints for gaps or disconnections. Do not operate the furnace if any are found.
- Step 2 – Room ventilation: Ensure adequate combustion air supply to the furnace room.
- Step 3 – Professional inspection: A qualified technician must perform a combustion analysis, check for flue leaks, and inspect the heat exchanger. Replace damaged flue sections or heat exchanger as required.
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Repair Difficulty
Professional Required
5/5
Required Part
Primary Heat Exchanger
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