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Lennox Pressure Switch 34M77
This part 34M77 is compatible with:
- Product Type:
- Furnace
- Brands:
- Lennox
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Common Problems Fixed by the Pressure Switch
Based on customer reports and repair data, this part commonly fixes these issues:
About the Pressure Switch
The pressure switch closes when the burner has sufficient airflow. If the pressure switch isn’t working, it might not close when the proper airflow is present, resulting in the furnace taking too long to heat the home. If the ignition process stalls, the furnace will shut off. To determine if the pressure switch is defective, use a multimeter to test the switch for continuity. If the pressure switch does not have continuity, replace it.
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