The pressure switch in a furnace is a critical safety component designed to ensure that the draft motor is functioning properly before allowing gas to flow into the combustion chamber. The draft motor is responsible for venting toxic exhaust gases out of the home. When the draft motor is operational, it creates a vacuum that pulls a rubber diaphragm inward on the pressure switch, which then triggers the gas valve to open and allow gas flow. If the pressure switch does not detect this vacuum, it prevents gas from entering the combustion chamber, thus preventing operation of the furnace.
Reasons why the pressure switch might keep tripping include:
- Damaged or Worn Out Diaphragm: If the diaphragm on the pressure switch is stuck, ruptured, or otherwise damaged, it may fail to trigger the gas valve. This can occur due to age or physical damage and often results in a soft, flapping sound when the heater is on. Replacement of the pressure switch is necessary in such cases.
- Physical Blockage: Any obstruction within the pressure switch can prevent the proper functioning of the diaphragm, leading to a failure in triggering the gas valve. This could be due to debris or other foreign objects interfering with the switch's operation.
- Back Drafting: This condition occurs when the pressure switch senses that the furnace is not drafting properly, indicating a potential buildup of toxic gases. This safety feature will shut down the furnace to prevent harmful gases from being released into the home.
In summary, the pressure switch keeps tripping on a furnace primarily due to issues with the diaphragm or physical blockages within the switch, which prevent it from detecting the necessary vacuum created by the draft motor. This safety mechanism is crucial for preventing the release of toxic gases and ensuring efficient operation of the furnace. If the pressure switch continues to trip, it is advisable to consult with an HVAC technician to diagnose and resolve the issue, which may involve repairing or replacing the pressure switch.
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