OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model PG8UAA036045ADJA

This is the factory OEM Integrated Furnace Control (IFC) board for the Carrier PG8UAA036045ADJA packaged gas furnace, sold under OEM part numbers HK42FZ016 and 325878-751. The IFC board is the brain of your furnace — it sequences every stage of the heating cycle, including inducer startup, hot surface ignition, gas valve activation, blower timing, and limit/pressure switch monitoring. When this board fails, common symptoms include a furnace that won't start, hard lockout after ignition attempts, erratic or short-cycling behavior, or a system that runs the inducer but never advances to ignition. In some cases, diagnostic LED fault codes on the board itself will point directly to board failure after all other components have been ruled out.

• OEM Part Numbers: HK42FZ016 (Integrated Furnace Control Board) | 325878-751 (Integrated Furnace Control Board Kit, includes wiring adapter harnesses for legacy installations) | 24V control circuit | Fixed-speed blower compatible
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part — not an aftermarket substitute. OEM boards carry exact firmware, relay ratings, and terminal layouts matched to the PG8UAA036045ADJA. Third-party boards may introduce timing mismatches or diagnostic code incompatibilities that complicate future troubleshooting.
• Install difficulty: 3/5 — Shut off power and gas before starting. Photograph all wiring harness connections before removal. The 325878-751 kit version includes adapter harnesses for older-style board connectors. Tools needed: 1/4" nut driver, flathead screwdriver, needle-nose pliers, phone camera for wiring reference. Allow 45–90 minutes. If fault codes are stored, note them before power-down for post-install verification.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PG8UAA036045ADJA packaged gas furnace unit. The 325878-751 kit supersedes HK42FZ016 and also replaces earlier board revisions including HK42FZ004, HK42FZ007, HK42FZ008, HK42FZ009, and HK42FZ011 — making it a broad-coverage upgrade for this product family. Always verify your existing board's part number against your unit's wiring diagram before ordering. Questions about fitment? Our HVAC-certified team confirms compatibility before you buy — order now and ship today.