Westinghouse Flame disturbance or pressure issue when blower starts

Furnace starts but shuts down as soon as the blower comes on.

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

Cracked heat exchanger causing flame disturbance, Negative pressure in combustion area due to duct leaks, Improper venting or blocked intake, Weak flame signal marginally lost when airflow changes

How to Fix / Troubleshooting

Critical safety: This symptom can indicate a cracked heat exchanger and potential carbon monoxide hazard. Install a CO detector if you do not have one and consider the furnace unsafe until inspected.

Basic checks:

Replace the air filter and ensure all registers are open.
Inspect intake and exhaust PVC pipes for blockages.
Clean the flame sensor.
If the problem persists, shut down the furnace and have a qualified technician perform a combustion analysis and heat exchanger inspection.

Repair Difficulty

Professional Required 5/5

Required Part

Heat Exchanger Assembly

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