Thermo Pride Flame Disturbance Due to Airflow

Furnace starts normally but shuts off when the blower comes on.

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

Improper burner flame pattern, Cracked heat exchanger on Thermo Pride furnace, Incorrect blower speed, Negative pressure in furnace room

Safety First: This symptom can indicate a cracked heat exchanger. Turn off the furnace and have it inspected immediately.

Observe flame: Through the sight glass, watch the flame as the blower starts. If the flame lifts, wavers, or is pulled away from the burner, shut down the furnace.
Check return air: Ensure the furnace room has adequate return air and is not being starved by closed doors or exhaust fans.
Professional inspection: A technician must inspect the heat exchanger, verify combustion, and adjust blower speed if necessary.

Professional Required 5/5

Heat Exchanger

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