The pressure switch in a furnace is a critical safety component. It ensures 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. This 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. This prevents the operation of the furnace.
Why Does the Pressure Switch Keep Tripping on My Furnace? 5 Key Reasons Explained
1. 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. It often results in a soft, flapping sound when the heater is on.
Replacement of the pressure switch is necessary in such cases.
2. Physical Blockage
Any obstruction within the pressure switch can prevent the proper functioning of the diaphragm. This leads to a failure in triggering the gas valve.
This could be due to debris or other foreign objects interfering with the switch's operation.
3. Back Drafting
This condition occurs when the pressure switch senses that the furnace is not drafting properly. It indicates a potential buildup of toxic gases.
This safety feature will shut down the furnace to prevent harmful gases from being released into the home.
4. Draft Motor Issues
If the draft motor is not functioning correctly, it may not create the necessary vacuum. This can cause the pressure switch to trip.
5. Wiring Problems
Faulty wiring or connections can also cause the pressure switch to malfunction. This can lead to frequent tripping.
Continue exploring, consult our experts
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