OEM Carrier Pressure Switch (High Fire & Low Fire) for Model PG8MVA048090AAJA

This listing covers both OEM Carrier pressure switches factory-specified for the Carrier PG8MVA048090AAJA two-stage gas furnace: HK06WC091 (High Fire, SPST) and HK06WC092 (Low Fire, SPDT — includes pressure tube). The pressure switch is a critical safety device that monitors negative pressure produced by the draft inducer motor. If the inducer fails to generate adequate suction, the switch stays open and the furnace locks out before the gas valve ever opens — protecting your heat exchanger from dangerous flue gas rollout.

• Specs — HK06WC091 (High Fire): SPST | Carrier/Honeywell Factory Authorized Part | Replaced by HK06MC110 where noted | Fits two-stage furnace high-fire proving circuit
• Specs — HK06WC092 (Low Fire): SPDT | Makes @ 0.22" W.C. | Resets @ 0.18" W.C. | Includes OEM pressure tube | Fits two-stage furnace low-fire proving circuit
• OEM vs Generic: These are genuine Carrier/Honeywell factory-authorized parts. Generic aftermarket switches frequently carry incorrect W.C. setpoints, causing nuisance lockouts or — worse — unsafe ignition attempts. OEM is the only safe choice on a pressure switch.
• Install difficulty: 3/5 — Confirm inducer motor operation before condemning the switch. Tools needed: manometer or magnehelic gauge, flat-head screwdriver, multimeter. Disconnect power before removing wiring. Verify W.C. rating on your unit's wiring diagram and data plate before installing. Note which port the pressure tube connects to on two-stage units.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered by cutoff time.

Compatibility: Engineered for the Carrier PG8MVA048090AAJA two-stage gas furnace. HK06WC091 serves the high-fire proving circuit; HK06WC092 serves the low-fire proving circuit — both switches may require replacement if the unit shows a pressure switch fault code. Always cross-reference the W.C. rating on your unit's wiring diagram before ordering. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy — order with confidence and get same-day shipping.