OEM Carrier Dual Pressure Switch Assembly HK06NB021 for Model PG95SAS42100CBAA

This OEM dual pressure switch assembly (part number HK06NB021) is the factory-specified replacement for the Carrier PG95SAS42100CBAA 95% AFUE single-stage gas furnace. The pressure switch monitors negative pressure created by the inducer draft motor to confirm proper venting before allowing the gas valve to open. When either switch in the assembly fails, the furnace control board receives no proof-of-draft signal and locks out the ignition sequence entirely — leaving you with a cold house and a blinking fault code.

• Specs: Dual pressure switch assembly | Monitors both high and low pressure stages | 24V control circuit | Factory-calibrated W.C. setpoints | Replaces OEM part numbers HK06NB021 and HK02LB008
• OEM vs Generic: This is a genuine Carrier OEM assembly, factory-set to exact water column (W.C.) trip points. Aftermarket switches often carry wider tolerances that can cause nuisance lockouts or, worse, unsafe furnace operation. Do not substitute generic on pressure-proving circuits.
• Install difficulty: 3/5 — Requires disconnecting hose ports, spade connectors, and verifying hose integrity. Tools needed: 1/4" nut driver, needle-nose pliers, digital manometer (recommended to verify W.C. post-install). Always power down and lock out before servicing.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PG95SAS42100CBAA packaged gas furnace. This dual assembly replaces both the primary draft pressure switch (HK06NB021) and the companion gas pressure switch (HK02LB008) where applicable. Verify your unit's data plate and existing switch W.C. ratings before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.