OEM Carrier Pressure Switch Kit for Model PG8JAA042090AFJA (HK02LB008 / HK06WC091 / HK06WC100)

This factory-matched OEM pressure switch kit is the correct replacement for the Carrier PG8JAA042090AFJA packaged gas furnace. The pressure switch proves that the inducer blower has established proper draft before allowing the ignition sequence to proceed. When any switch in this circuit fails, the control board sees an open pressure switch fault and locks out — preventing burner ignition entirely. Common symptoms include a furnace that powers on, runs the inducer for 30–90 seconds, then shuts down with no spark or heat. This kit covers all three OEM part numbers used across PG8JAA042090AFJA production variants: HK02LB008 (Gas Pressure Switch, 6.5" W.C. cut-out, LP/NG rated), HK06WC091 (SPST Inducer Pressure Switch), and HK06WC100 (Pressure Switch with Mounting Bracket).

• Specs: HK02LB008 — 6.5" W.C. cut-out | LP & Natural Gas rated | Horizontal or vertical mount | Replaces HK02MB008 | HK06WC100 — 0.27" W.C. Break / 0.42" W.C. Max Make | SPST normally-open contacts | 24V control circuit compatible
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact W.C. setpoints. Off-brand substitutes frequently carry ±15% W.C. tolerances, causing nuisance lockouts or — more dangerously — failing to prove draft, both of which shorten heat exchanger life and void manufacturer warranties.
• Install difficulty: 2/5 — Power down and lock out the unit before starting. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, and a manometer or magnehelic gauge for post-install verification. Photograph all hose routing before disconnecting. Inspect rubber hoses for cracks or blockages while the switch is out — a clogged port is a frequent root cause of switch failure.
• Warranty & Shipping: 1-year OEM factory warranty. Orders placed before 3 PM local time ship same business day from our climate-controlled warehouse.

Compatibility: Engineered for the Carrier PG8JAA042090AFJA packaged gas furnace. Always verify your unit's data plate W.C. rating and fuel type (LP vs. NG) before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.