OEM Carrier Pressure Switch with Bracket -0.33 WC for Model PG8UAA048135ABJA — Part# HK06WC090

This is the OEM factory-specified pressure switch with integrated mounting bracket for the Carrier PG8UAA048135ABJA packaged gas furnace. The pressure switch is a normally-open safety device that monitors negative pressure created by the inducer draft motor. Once the inducer reaches proper operating speed and the correct negative pressure is achieved, the switch closes and signals the control board to advance the ignition sequence. When it fails, the furnace will lock out before ignition — often displaying a pressure switch fault code — leaving you with no heat.

• Specs: -0.33 W.C. (water column) trip point | Includes factory mounting bracket | Single-port, normally open | OEM-matched electrical connector
• OEM vs Generic: This is a genuine Carrier OEM part (HK06WC090) manufactured to exact factory tolerances. Generic pressure switches often carry wide trip-point variances that can cause nuisance lockouts or, worse, fail to protect against dangerous backdraft conditions.
• Install difficulty: 2/5 — Power down and confirm zero voltage at the unit before starting. Tools needed: 1/4" nut driver, flat-head screwdriver, and a U-tube manometer or digital manometer if verifying trip point. Photograph the hose and wiring connections before removal. Swap the rubber sensing hose and reconnect the two-wire harness on the new switch.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Directly fits the Carrier PG8UAA048135ABJA packaged gas furnace. This part also supersedes and replaces earlier Carrier pressure switch part numbers including HK06WC088, HK06WC086, HK06WC076, HK06WC073, HK06WC074, HK660001, 310315-751, 310315-752, and 326750-751. Always verify the W.C. rating on your existing switch before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.