How the Pressure Switch Protects Your Furnace Modern gas furnaces rely on a pressure switch to monitor the strength of airflow generated by the inducer motor. Common Failure Modes Over time, the internal diaphragm and contacts inside the pressure switch can wear out, especially in harsh environments with frequent short cycling.
Furnace Pressure Switch Reset Guide: Step-by-Step Troubleshooting
Addressing filter changes, ensuring proper combustion air supply, and resolving minor venting issues promptly can significantly extend the life of the pressure switch and reduce the likelihood of unexpected lockouts during cold weather. This small but critical component acts as a guardian, ensuring the blower and inducer motor create enough draft for proper exhaust before allowing the main burners to ignite.
During tune-ups, technicians can blow out debris from the venting system, inspect the draft inducer, and check the switch for signs of fatigue or delayed response. Many modern systems require a manual reset on the control board or a cycle of the thermostat before the furnace will restart, so follow the manufacturer’s guidance to ensure proper operation.
How to Reset a Faulty Furnace Pressure Switch Safely
When your furnace pressure switch goes bad, the system can no longer verify that the flue is clear and vents are functioning, which triggers a safety shutdown to prevent dangerous carbon monoxide buildup. Regular maintenance, including annual professional service, helps keep the pressure switch and its tubing clean and functional.
More About What happens when a furnace pressure switch goes bad
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