OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model PG9MAA036040ABKA

This is the factory OEM Integrated Furnace Control (IFC) board — part numbers HK42FZ016 and 325878-751 — designed as the direct replacement for the Carrier PG9MAA036040ABKA gas furnace. The IFC board is the brain of your furnace: it sequences the inducer motor, hot surface igniter, gas valve, and blower in precise timed stages. When it fails, symptoms include a hard lockout with no ignition attempt, erratic short-cycling, failure to energize the blower after a call for heat, or a furnace that powers on but immediately shuts down. Fault codes displayed on the board's LED are your first diagnostic clue.

• OEM Part Numbers: HK42FZ016 (Integrated Furnace Control Board) | 325878-751 (Integrated Furnace Control Board Kit — includes wiring harness adapters for backward-compatible retrofits on older board styles)
• OEM vs Generic: OEM boards carry factory-programmed timing sequences, fault-code logic, and component protection algorithms specific to Carrier engineering specs. Aftermarket boards may ship with mismatched ignition timing or missing safety lockout logic, risking nuisance shutdowns or unsafe operation.
• Install Difficulty: 3/5 — Disconnect 120V power and label all low-voltage wiring before removal. The 325878-751 Kit includes plug-in harness adapters if upgrading from an older-style covered board. Tools needed: 1/4" nut driver, needle-nose pliers, smartphone for wiring photos. Allow 30–45 minutes. Always verify fault code history before condemning the board.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG9MAA036040ABKA gas furnace. The 325878-751 kit supersedes HK42FZ016 and also replaces HK42FZ011, HK42FZ008, HK42FZ007, HK42FZ004, and HK42FZ009. Confirm your existing board's part number on the label before ordering. In stock and ready to ship today — get your heat back fast.