Product Name
$0.00
✅ In Stock
🚚 Ships Today
🔒 OEM Certified
🔄 30-Day Return
Same-day dispatch if ordered by 3PM CST
Free shipping on orders $75+
Check compatibility before ordering
IMAGE COMING SOON
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The genuine OEM Lennox 56M93 pressure switch is an air-proving safety device that confirms your furnace's draft inducer is moving combustion gases correctly before the burners ignite. It senses the negative pressure created by the inducer motor and closes its contacts to allow ignition, ensuring the flue is clear and exhaust is venting safely away from your home.
Common failure symptoms: A stuck or failed 56M93 pressure switch is a frequent cause of no-heat calls. Symptoms include the furnace failing to ignite, the inducer running but burners never lighting, repeated system lockouts, or a diagnostic code indicating an open or stuck-closed pressure switch. A cracked hose, blockage, or worn diaphragm can all trigger a fault.
Why OEM matters: Pressure switches are calibrated to a specific trip point measured in inches of water column. Using a switch with the wrong setpoint can allow the furnace to fire under unsafe venting conditions or block ignition entirely. The factory-spec 56M93 is matched to your Lennox model's exact pressure requirements for safe, dependable operation.