IVT Contaminated combustion air or heat exchanger issue

Furnace causes a metallic or chemical smell in the home

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

Combustion air drawn from area with chemicals (paints, solvents), Cracked heat exchanger, Flue gas recirculation, Contaminants on heat exchanger surfaces

How to Fix / Troubleshooting

Safety: Turn off power and gas. If occupants feel unwell, leave the building and call emergency services.

Check combustion air source: Ensure the IVT furnace is not drawing air from a garage, workshop, or storage area with chemicals.
Inspect flue and intake: Verify that the flue and intake are correctly installed and separated to prevent recirculation.
Do not operate: Do not use the furnace until a qualified technician has inspected the heat exchanger and combustion system for cracks or contamination.

Repair Difficulty

Professional Required 5/5

Required Part

IVT primary heat exchanger

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