OEM Carrier Pressure Switch w/ Bracket 1.81" WC SPST for Model PG9MAB024040ABSA

This OEM pressure switch (part# HK06NB124) is the factory-specified replacement for the Carrier PG9MAB024040ABSA gas furnace. The pressure switch proves that the inducer motor has created adequate negative pressure before allowing the ignition sequence to proceed — a critical safety interlock in every 90%+ efficiency furnace. When this switch fails or its diaphragm stiffens, the control board cannot confirm proper draft and will lock out ignition, typically logging an error code 31 (pressure switch stuck open). The result: a furnace that attempts to start, fails, and shuts down before any heat is produced.

• Specs: 1.81" W.C. (inches water column) | SPST (Single-Pole, Single-Throw) | 1/4" barb hose connection | Includes factory mounting bracket | Rated for residential gas furnace application
• OEM vs Generic: This is the genuine Carrier OEM part — factory-calibrated to the exact 1.81" W.C. set point required by your PG9MAB024040ABSA. Generic aftermarket switches often carry ±5–10% tolerance variance, which can cause nuisance lockouts or, worse, allow operation under unsafe draft conditions.
• Install Difficulty: 2/5 — A straightforward swap accessible to experienced DIYers. Tools needed: 1/4" nut driver, flat-head screwdriver, and a phone camera to document hose routing before disconnecting. Power down and gas-off the furnace before beginning. Note port orientation when transferring hoses from the old switch to the new bracket.
• Supersedes: HK06NB124 is the current consolidated replacement for obsolete part numbers HK06NB119, HK06NB120, and HK06NB122. Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG9MAB024040ABSA gas furnace. This part covers over 200 Carrier and Bryant residential furnace models — always verify the 1.81" W.C. rating against your unit's data plate or existing switch label before ordering. Our team is available to confirm fitment prior to purchase. Order today and receive same-day shipping on all in-stock OEM parts.