Sime Flue Resonance / Gas Flow Whistle

Furnace emits a high‑pitched whistling noise from the flue or burner area 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

Partially blocked flue, Incorrect flue length or configuration, Gas valve pressure set too high, Damaged burner ports

Safety first: Turn off power and gas if the noise is severe or accompanied by smell of fumes.

Inspect flue terminal: Check for obstructions at the terminal and remove any debris.
Check flue joints: Ensure all flue sections are properly seated and sealed according to Sime instructions.
Do not adjust gas valve yourself: Whistling due to gas pressure requires a technician to measure and adjust the valve and, if necessary, replace the burner.

Hard 4/5

Flue System / Gas Valve

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