OEM Carrier Integrated Furnace Control Board HK42FZ016 / 325878-751 for Model PG8UAA066111ADJA

This is the factory OEM integrated furnace control (IFC) board for the Carrier PG8UAA066111ADJA gas furnace, catalogued under part numbers HK42FZ016 and its current OEM successor 325878-751. The IFC board is the central nervous system of your furnace — it sequences ignition, monitors flame, controls the inducer and blower motors, manages the gas valve, and provides diagnostic LED fault codes. When this board fails, symptoms range from complete no-heat lockout and erratic blower operation to nuisance shutdowns, error codes, and failure to sequence through the ignition trial.

• Specs: Input: 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 / 8.0A LRA at 120 VAC | Compatible with 24 VAC standard thermostat | Diagnostic LED fault code indicator included
• OEM vs. Generic: This OEM board is factory-programmed with Carrier's exact sequencing timing, brownout protection thresholds, and ignition retry logic. Generic aftermarket boards use approximated firmware that can cause nuisance lockouts, improper blower-off delays, or shortened heat exchanger life due to incorrect fan timing.
• Install Difficulty: 3/5 — Requires 120V line voltage work; always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, phone/camera to photograph all wiring connections before removal. Note: the 325878-751 kit version includes adapter harnesses for older wiring configurations — confirm your existing harness type before ordering.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for Carrier model PG8UAA066111ADJA fixed-speed gas furnace. Also cross-references Carrier/Bryant/Payne models using HK42FZ004, HK42FZ007, HK42FZ008, HK42FZ009, HK42FZ011, HK42FZ013, HK42FZ016, HK42FZ034, and 325878-751. Verify your existing part number from the board label or data plate before ordering. Not sure? Our HVAC parts specialists confirm fitment before you buy — contact us today. In stock and ships today.