OEM Carrier SPST High-Fire Pressure Switch for Model PG8MAA036070AAJA

This OEM pressure switch (part# HK06WC091, also supplied as assembly HK06WC069 with bracket) is the factory-specified inducer proving switch for the Carrier PG8MAA036070AAJA gas furnace. Its job is critical: it monitors the negative pressure (draft) created by the inducer motor and signals the control board that safe flue venting is confirmed before allowing ignition to proceed. When this switch fails or drifts out of calibration, the furnace will lock out — typically before the igniter even glows — leaving you with a no-heat call and a fault code pointing to a pressure switch open condition.

• Specs: 0.27" W.C. break point | 0.42" W.C. max break | SPST (Single Pole, Single Throw) | 28VA @ 24VAC pilot duty rating | Factory-calibrated Honeywell-manufactured diaphragm assembly
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part built by Honeywell. Generic aftermarket switches commonly ship with ±15% W.C. tolerance — a mismatch that causes nuisance lockouts or, worse, allows the furnace to fire without proper draft. OEM means the setpoint is exact.
• Install difficulty: 2/5 — Shut off power and gas before starting. Tools needed: flathead screwdriver, 1/4" nut driver, multimeter (to confirm open/closed across switch terminals), and a manometer if verifying inducer draft. Disconnect the two wires and single hose port, swap, and reconnect. Note: HK06WC069 includes the mounting bracket — confirm your application before ordering.
• Warranty & Shipping: 1-year OEM factory warranty. In stock and ships same business day from our warehouse. Replaces discontinued OEM part numbers HK06WC091 and HK06WC069 — current updated OEM cross-reference is HK06MC110.

Compatibility: Engineered for the Carrier PG8MAA036070AAJA packaged gas furnace. Also fits many Carrier, Bryant, and Payne gas furnace models sharing the same 0.27" W.C. SPST high-fire pressure switch specification — always verify your unit's data plate W.C. rating before ordering. Have a fitment question? Our HVAC parts team confirms compatibility before you buy.