Sime Flue Gas Leakage / Poor Combustion

Furnace or flue area smells of exhaust fumes or a sharp acidic odor during operation.

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

Damaged flue seals, Loose flue joints, Cracked heat exchanger, Blocked flue

Danger: Possible carbon monoxide risk. Do not continue to operate the furnace.

Turn off furnace: Switch off power and gas immediately.
Ventilate area: Open windows and doors.
Check flue visually: From a safe distance, look for disconnected or damaged flue sections. Do not dismantle combustion components yourself.
Call a qualified technician: A Sime‑trained technician must inspect the flue, seals, and heat exchanger, perform combustion analysis, and certify safe operation before use.

Professional Required 5/5

Flue System / Primary Heat Exchanger

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