Rheem Furnace Pressure Switch Replacement

Rheem Furnace Pressure Switch Parts

The pressure switch is your furnace's safety sentinel — it monitors airflow through the heat exchanger and prevents the igniter from firing if vent blockage is detected. When your Rheem furnace won't start, clicks repeatedly, or displays a lockout code, a failed pressure switch is often the culprit. Rheem pressure switches are model-specific, so verify your furnace model number before ordering.

Common symptoms that point to pressure switch failure: furnace starts then immediately shuts down, inducer motor runs but igniter won't fire, or error codes 12 or 14 flashing on the control board. Always check the inducer motor, venting system, and hose connections first — a blocked condensate drain or cracked rubber hose can trigger switch failure symptoms before the switch itself goes bad.

• Pressure switch won't close: Furnace won't ignite; inducer runs normally; error code appears
• Pressure switch stuck open: Igniter glows but gas valve won't open; click-and-lock cycle repeats
• Cracked or kinked pressure hose: Switch senses false blockage; furnace lockout
• Inducer motor bearing failure: Motor spins slow; switch detects low pressure and shuts down
• Condensate drain clogged: Water backs up; pressure switch detects blockage; safety shutdown

Rheem Furnace Pressure Switch FAQ

How do I know if my Rheem pressure switch has failed?

A failed pressure switch often causes your furnace to start the inducer motor, then shut down before ignition. You may see the igniter glow orange briefly, hear clicking from the solenoid gas valve, or see error codes (commonly 12 or 14) on the control board. The most reliable test is using a multimeter to check continuity — the switch should close when negative pressure is applied to the hose port. If it won't close, or continuity doesn't change, replacement is needed.

Can I clean my pressure switch instead of replacing it?

Pressure switches have sealed contacts and diaphragms — cleaning won't fix electrical failure. However, if the hose connection is loose or the tube is cracked, tightening or replacing the hose may restore function. Always inspect the rubber hose and the hose port on the inducer motor before replacing the switch itself. A pinhole in the hose can mimic switch failure.

Why is my Rheem furnace pressure switch code showing but the switch tests good?

If the switch passes a continuity test but the furnace still locks out, check the inducer motor and venting system. A weak inducer motor won't develop full negative pressure — the switch opens (correctly), but pressure isn't strong enough to keep it closed. Also inspect the condensate drain tube; if it's backed up with algae or ice, the furnace safety system shuts down before the switch can close. Use your model number to find the exact switch and confirm the correct pressure threshold for your furnace.

How do I find my Rheem furnace model number for the right pressure switch?

Model numbers on Rheem furnaces are stamped on the furnace cabinet (left or right side, near the bottom) or on a rating plate inside the blower compartment. It starts with R or RGAH followed by numbers. Take a photo and enter it in our model lookup — we'll confirm the exact pressure switch assembly and spring tension for your model.

Order Rheem Furnace Pressure Switches Online

Get your Rheem furnace back running right with our easy online ordering for pressure switch replacements. Our extensive inventory ensures you find the exact part you need quickly, and our user-friendly lookup tool lets you search by model or part number. With our Price Match Guarantee, you can shop confidently, knowing we match competitor prices for all genuine OEM parts. Plus, Most orders ship the same day, ensuring your furnace is up and running quickly. Visit our replacement parts page for more parts and categories.

Rheem Furnace Model Number: Where to Look

On Rheem furnaces, look for the model number on the cabinet's left or right side near the bottom, or on the rating plate inside the blower compartment. The label may also include the serial number, electrical information, and heating specifications, so be sure to choose the model number rather than the serial number. Enter that model number in our model number search to pull up the parts matched to your unit. Using the complete model number filters the catalog for the entire furnace, including the pressure switch and every other associated part, instead of leaving you to compare specifications by hand. It is the quickest way to be sure the part fits before you order.