Beretta Airflow-Induced Flame Instability

Furnace starts but shuts down when blower starts, sometimes with noticeable duct movement

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

Incorrect burner pressure, Blocked or poorly designed return air, Heat exchanger crack causing flame disturbance, Blower speed too high

Safety: Turn off power and gas. This can indicate a serious safety issue.

Check filter and returns: Ensure filters are clean and return air paths are not blocked, which can cause abnormal pressure in the combustion area.
Observe flame: A technician should observe the flame when the blower starts to check for flame rollout or lifting.

Do not continue to operate the furnace until a qualified technician has inspected it.

Professional Required 5/5

Primary Heat Exchanger

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