OEM Carrier Integrated Furnace Control Board HK42FZ016 / 325878-751 for Model PG8UAA042091ADJA

This is the OEM factory-authorized Integrated Furnace Control (IFC) board for the Carrier PG8UAA042091ADJA gas furnace. Originally sold as HK42FZ016 and updated to the current production kit 325878-751, this board is the central brain of your furnace — orchestrating ignition sequencing, blower motor timing, inducer operation, gas valve control, and system-wide fault detection. When it fails, you may see a complete no-heat lockout, erratic blower behavior, or a fault code on the diagnostic LED that cannot be cleared by cycling power.

• Specs: Input range 98–132 VAC at 60 Hz | Ignitor output: 5A at 120 VAC | Cool blower: 30A, 2 HP, 240 VAC | Heat blower: 5A, 1/2 HP, 240 VAC | Inducer motor: 4A / FLA-8.0 LRA at 120 VAC | Compatible with 24 VAC standard thermostat | Diagnostic LED fault codes included
• OEM vs Generic: This is the genuine Carrier OEM board — not a third-party ICM282 clone. OEM boards are factory-programmed with Carrier-specific timing sequences and safety thresholds. Generic aftermarket boards may use looser tolerances and lack firmware precision, risking nuisance lockouts or reduced component life.
• Install Difficulty: 3/5 — The 325878-751 kit ships with adapter wiring harnesses for plug-and-play installation on older HK42FZ016-equipped units. Before removing the original board, photograph all wire connections. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone camera. Always disconnect 120V power and verify with a multimeter before touching terminals. Ground yourself to prevent ESD damage to the new board.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse in original Carrier factory packaging.

Compatibility: Direct OEM replacement for Carrier model PG8UAA042091ADJA gas furnace. Part number 325878-751 is the current superseding replacement for legacy part HK42FZ016 — both numbers are confirmed cross-references. Also fits Bryant and Payne models sharing the HK42FZ series control board platform. Verify your original board's part number against the furnace data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence and get your heat back today.