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PRESSURE SWITCH - FURNACE

Shop furnace pressure switches at Open To Public HVAC Parts in Dallas. We carry draft pressure switches, vent pressure switches, and blocked vent safety switches for gas furnaces. Compatible with Goodman, Rheem, Carrier, Trane, Lennox, and more — OEM and aftermarket options in stock.

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In-Store Pickup Only — Browse our catalog below, then visit us in Dallas or call (214) 340-9421 to purchase.

Signs You May Need a New Furnace Pressure Switch

The pressure switch is a safety device that confirms the inducer motor is pulling proper draft before allowing gas to flow. If it fails or can't close, the furnace won't ignite.

Furnace Starts Inducer but Won't Ignite
  • The inducer motor runs but ignition never happens.
  • The pressure switch should close once draft is established — if it doesn't, the sequence stops.
  • Check the rubber hose connecting the switch to the inducer housing for cracks or blockages.

Before replacing the pressure switch, check: (1) Is the drain line clogged? (2) Is the inducer hose cracked? (3) Is the flue vent blocked? These are the most common causes.

🔴Pressure Switch Error Code on Control Board
  • The diagnostic LED shows a code indicating "pressure switch stuck open" or "stuck closed."
  • "Stuck open" means the switch never closes — check the inducer and hose first.
  • "Stuck closed" means the switch is welded shut and needs replacement.
🔄Intermittent Furnace Shutdowns
  • Furnace lights successfully sometimes but fails on other attempts.
  • A weak pressure switch may close intermittently depending on draft conditions.
  • Wind gusts or a partially blocked flue can cause inconsistent pressure readings.
Not sure which part you need? Bring your old part to our Dallas store — our team will test it for free and help you find the right replacement.
📞 (214) 340-9421Mon–Fri 10 am – 7 pm  |  Sat 10 am – 3 pm