OEM Carrier Integrated Furnace Control Board HK42FZ016 / 325878-751 for Model PG9MAA048100AAKA

This is the factory-specified OEM integrated furnace control board (IFC) for the Carrier PG9MAA048100AAKA gas furnace. Originally sold under part number HK42FZ016 and superseded by the updated kit 325878-751, this board is the brain of your furnace — it orchestrates ignition sequencing, blower motor timing, inducer operation, gas valve control, and continuous safety monitoring. When the IFC fails, symptoms typically include a complete no-heat lockout, short-cycling after ignition, blower running non-stop, or a flashing diagnostic LED fault code with no furnace operation.

• Specs: Input: 98–132 VAC @ 60 Hz | Ignitor Output: 5A @ 120 VAC | Cool Blower: 30A, 2 HP, 240 VAC | Heat Blower: 5A, 1/2 HP, 240 VAC | Inducer Motor: 4A FLA / 8.0 LRA @ 120 VAC | Gas Valve: 24 VAC | Diagnostic LED fault codes included | Compatible with 24 VAC standard thermostat
• OEM vs Generic: This is the genuine Carrier OEM board — factory-programmed with exact ignition timing, blower delay profiles, and safety lockout thresholds for the PG9MAA048100AAKA. Aftermarket boards may use looser tolerances that cause nuisance lockouts or premature heat exchanger wear. The 325878-751 kit includes wiring harness adapters for seamless plug-and-play installation on older HK42FZ-series wiring harnesses.
• Install Difficulty: 3/5 — Requires careful labeling of all wire connections before removal. Tools needed: #2 Phillips screwdriver, 1/4" nut driver, needle-nose pliers, phone/camera to photograph existing wiring. Discharge any residual capacitor voltage and confirm 24V control fuse integrity before powering up the new board. Consult the included fault code label and furnace wiring diagram.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse in original OEM packaging.

Compatibility: Engineered for Carrier model PG9MAA048100AAKA single-stage gas furnace. This board also services related Carrier, Bryant, and Payne fixed-speed furnace platforms sharing the HK42FZ-series control architecture. Always verify your existing part number on the board label before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — contact us today and get your furnace back online fast.