OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model PG8UAA048091ABJA

This OEM Integrated Furnace Control (IFC) Board is the factory-specified replacement for the Carrier PG8UAA048091ABJA gas furnace. Also sold as kit part number 325878-751, this board is the command center of your furnace — sequencing ignition, managing the inducer and blower motors, monitoring safety circuits, and communicating fault codes via LED diagnostics. When the control board fails, symptoms range from complete no-heat lockouts and repeated ignition failures to erratic blower behavior, unresponsive thermostat calls, or a furnace that short-cycles without explanation.

• Specs: OEM Part Numbers: HK42FZ016 / 325878-751 | Integrated Furnace Control (IFC) | 120V input | 24V control circuit output | Factory-programmed timing sequences | LED fault code diagnostics included
• OEM vs Generic: This is a genuine Carrier OEM board — pre-programmed with the exact ignition timing, blower delay, and safety lockout logic required by the PG8UAA048091ABJA. Aftermarket boards often use generalized firmware that can trigger nuisance lockouts, void equipment warranties, or fail to communicate correctly with two-stage or variable-speed components.
• Install Difficulty: 3/5 — Requires disconnecting 120V line voltage. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone or camera (photograph all wiring harness connections before removal), and a multimeter to verify 24V transformer output prior to install. We recommend a licensed HVAC technician for board replacements involving multi-wire harnesses.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PG8UAA048091ABJA packaged gas furnace. Cross-reference both OEM part numbers — HK42FZ016 and 325878-751 — against your unit's data plate and existing board label before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us anytime.