OEM Carrier Pressure Switch w/ Bracket 1.81" WC for Model PG9MAB048060AASA

This OEM pressure switch with mounting bracket (part number HK06NB124) is the factory-specified replacement for the Carrier PG9MAB048060AASA gas furnace. The pressure switch monitors negative pressure created by the inducer motor to confirm that the flue is properly venting before allowing the control board to advance to the ignition sequence. When this switch fails or sticks open, your furnace will lock out before ignition — typically displaying a fault code indicating a pressure switch failure — leaving you with no heat until the part is replaced.

• Specs: 1.81" W.C. set point | SPST (single-pole, single-throw) | Normally open | Includes factory mounting bracket | Manufactured by Honeywell for Carrier
• OEM vs Generic: This OEM switch is calibrated to the exact water column rating required by the PG9MAB048060AASA. Off-brand switches often carry ±10–15% WC tolerances, which can cause nuisance lockouts or — worse — allow the furnace to fire under unsafe venting conditions.
• Install difficulty: 2/5 — Power down and shut off gas before beginning. Disconnect the two low-voltage spade terminals (different sizes — they only connect one way), remove the rubber hose(s), unbolt the old bracket, and mount the new assembly. Tools needed: flat-head screwdriver, 1/4" nut driver, phone camera to photograph hose routing before removal.
• Warranty: 1-year OEM manufacturer warranty against defects. Supersedes obsolete part numbers HK06NB119, HK06NB120, HK06NB122, and HK06NB123. Ships same business day from our warehouse.

Compatibility: Fits Carrier model PG9MAB048060AASA gas furnace. This switch is also used across more than 200 Carrier and Bryant residential furnace models — verify your unit's data plate and existing WC rating before ordering. Our parts team is available to confirm fitment prior to purchase. Order before 3 PM and your part ships today.