OEM Carrier Pressure Switch with Bracket HK06NB124 for Model PG9MAB048080AASA

This OEM pressure switch with mounting bracket (part #HK06NB124) is the factory-specified replacement for the Carrier PG9MAB048080AASA gas furnace. The pressure switch monitors negative pressure generated by the inducer motor during each heating cycle. When the inducer achieves proper draft, the switch closes and signals the control board to advance to ignition. A failed or stuck-open pressure switch causes the furnace to lock out before ignition — commonly displayed as a fault code — leaving you with no heat. Replacing it with the correct OEM part restores precise pressure sensing and safe furnace operation.

• Specs: SPST (Single-Pole, Single-Throw) | Set Point: -1.65" W.C. | 1/4" barb port connection | Includes factory mounting bracket | Manufactured by Honeywell for Carrier
• OEM vs Generic: This is a genuine OEM Carrier part engineered to exact factory tolerances. Generic aftermarket switches often carry wider set-point tolerances (±0.10" W.C. or more), which can cause nuisance lockouts or — more dangerously — allow furnace operation under unsafe draft conditions.
• Install difficulty: 2/5 — Power down the furnace at the disconnect and thermostat before starting. Tools needed: #2 Phillips screwdriver, 1/4" nut driver, needle-nose pliers. Photograph all tubing connections and wiring spade terminals before removal. Note: HK06NB124 supersedes HK06NB119, HK06NB120, and HK06NB122 — port orientation may differ from older units, so verify hose routing matches the labeled (+) and (-) ports on the new switch.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Direct OEM replacement for Carrier model PG9MAB048080AASA gas furnace. This switch is also the current superseding part for over 200 Carrier and Bryant residential furnaces previously using HK06NB119, HK06NB120, and HK06NB122. Always verify the W.C. rating on your existing switch's data label before ordering. Have fitment questions? Our HVAC parts specialists confirm compatibility before you buy — and we ship same day so your furnace is back online fast.