This small, often overlooked component acts as a guardian, verifying that the inducer fan is creating sufficient airflow to clear combustion gases. Checking a furnace pressure switch is a fundamental diagnostic task that ensures your heating system operates safely and efficiently.
Diagnosing Low Pressure Faults: Inspecting the Pressure Switch and Airflow
If the switch does not register the correct pressure within a few seconds of the fan starting, it signals the control board to halt the ignition process. This prevents the furnace from running with blocked vents or a failing blower, which could lead to dangerous carbon monoxide buildup.
Furnaces involve high voltage and sensitive components, and skipping this step poses a serious risk of electrical shock. Blockages in the flue vent, a failing inducer motor, or a clogged air filter can prevent the switch from sensing the proper airflow.
Diagnosing Low Pressure Faults: Inspecting Flue Blockages and Inducer Airflow
Checking for Blockages and Airflow Issues A pressure switch can fail not because it is broken, but because it is doing its job correctly. First, disconnect the two wires connected to the switch terminals.
More About How to check a furnace pressure switch
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