OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model GB3AAV024070ADJA

This is the factory OEM integrated furnace control board (IFC) for the Carrier GB3AAV024070ADJA gas furnace. The control board is the brain of your heating system — it sequences the inducer motor, hot surface igniter, gas valve, and blower fan through every heating cycle. When this board fails, you may experience symptoms including a hard lockout with a blinking fault code, no ignition attempts, random short-cycling, or a furnace that simply won't respond to a thermostat call for heat. Replacing with the correct OEM board ensures every timing sequence, safety interlock, and diagnostic LED function performs exactly as Carrier engineered.

• Specs: OEM Part Numbers: HK42FZ016 / 325878-751 | Integrated Furnace Control (IFC) board | 24V control circuit | Compatible with single-stage gas valve and HSI ignition sequence | Onboard diagnostic fault-code LED
• OEM vs Generic: OEM control boards are programmed with Carrier's exact timing algorithms for inducer pre-purge, igniter warm-up, and flame-proving delay. Aftermarket boards frequently use approximated timing that can trigger nuisance lockouts, void equipment warranties, or — in worst cases — compromise safety shutoff sequences.
• Install Difficulty: 3/5 — Requires disconnecting 120V line voltage. Always shut off the furnace disconnect switch and confirm power is off with a multimeter before starting. Tools needed: Phillips and flat-head screwdrivers, needle-nose pliers, phone/camera to photograph all wiring harness connections before removal. Transfer wiring harnesses one connector at a time to avoid miswiring.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before our daily cutoff ship same business day from our stocked warehouse.

Compatibility: This board is the direct OEM replacement for the Carrier GB3AAV024070ADJA gas furnace. Cross-references OEM part numbers HK42FZ016 and kit number 325878-751. Always verify your existing board's part number against the data label inside your furnace's control compartment before ordering. Our fitment team is available to confirm compatibility — reach out before you buy if you have any questions. In stock and ready to ship today.