OEM Carrier Gas Pressure Switch HK02LB008 for Model PG8MAA036110AFJA

This OEM Carrier gas pressure switch (part number HK02LB008) is the factory-authorized replacement for the Carrier PG8MAA036110AFJA packaged gas furnace. The pressure switch monitors the negative pressure created by the inducer motor, proving that the venting system is operating safely before allowing the ignition sequence to proceed. When this switch fails, the furnace will lock out before ignition — often displaying a fault code — because it cannot confirm that combustion gases are being safely exhausted. Also cross-references as HK06WC091 (Pressure Switch) and HK06WC100 (Pressure Switch w/ Bracket) for variant configurations.

• Specs: Cut-out pressure set at 6.5 in. w.c. | LP / Propane gas application | Compact form factor: 3.45"D × 3.4"W × 3"H | Weight: 0.22 lbs | Made in Mexico
• OEM vs Generic: This is a factory-authorized OEM part manufactured to exact Carrier tolerances. Generic switches may carry ±15% pressure variance, causing nuisance lockouts or — worse — failing to catch a true venting fault. Never substitute a generic switch on a gas-fired appliance.
• Install Difficulty: 2/5 — Straightforward swap accessible at the inducer assembly. Tools needed: 1/4" and 5/16" nut driver, needle-nose pliers, and a manometer to verify cut-out pressure post-install. Always turn off gas and power before servicing. If your replacement includes a bracket (HK06WC100), confirm bracket orientation matches original mounting.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from NationalHVACParts.com warehouse.

Compatibility: Engineered for the Carrier PG8MAA036110AFJA packaged gas furnace. Also cross-references OEM part numbers HK06WC091 and HK06WC100. Note: HK02LB008 has been superseded — the current manufacturer direct replacement is HK02MB008; this listing covers the OEM equivalent. Verify your unit's data plate and existing switch markings before ordering. Questions about fitment? Our HVAC parts specialists verify compatibility before every order ships.