OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model GB1AAV042091ADJA

This is the factory OEM integrated furnace control board (IFC) for the Carrier GB1AAV042091ADJA gas furnace, sold under OEM part numbers HK42FZ016 and kit number 325878-751. The control board is the nerve center of your furnace — it sequences the inducer motor, hot surface igniter, gas valve, and blower fan through every heating cycle. When it fails, symptoms typically include a furnace that won't start, locks out after one or more ignition attempts, runs the blower continuously without heat, displays fault codes on the LED indicator, or behaves erratically between heating cycles. Replacing a failed control board with the correct OEM part restores factory-programmed timing sequences and fault diagnostics, ensuring safe and reliable operation.

• Specs: Integrated Furnace Control (IFC) board | OEM part numbers HK42FZ016 / 325878-751 | 24V control circuit compatible | Factory-programmed ignition timing and blower delays for Carrier GB1AAV042091ADJA
• OEM vs Generic: OEM control boards carry factory-matched firmware and component tolerances. Aftermarket boards often omit model-specific fault codes, mis-time ignition sequences, and lack the same surge protection, potentially shortening the life of your igniter, gas valve, and blower motor.
• Install difficulty: 3/5 — Requires disconnecting 120V power and low-voltage wiring harnesses. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, smartphone (photograph all wiring before removal). Note and match all connector positions exactly. If fault LED codes are present before replacement, record them for diagnostic reference.
• Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed as a direct OEM replacement for the Carrier GB1AAV042091ADJA gas furnace. Cross-reference your existing board's part number (HK42FZ016 or 325878-751) against your unit's data plate and wiring diagram before ordering to confirm fitment. Not sure? Our HVAC parts specialists verify compatibility before every order — contact us before you buy.