OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model GB1AAV048091AEJA

This OEM integrated furnace control (IFC) board — part numbers HK42FZ016 and 325878-751 — is the factory-specified replacement for the Carrier GB1AAV048091AEJA gas furnace. The control board serves as the brain of your heating system, orchestrating the ignition sequence, managing the inducer and blower motors, monitoring safety switches, and communicating fault codes via diagnostic LED. When this board fails, you may experience a complete no-heat condition, repeated ignition lockouts, erratic blower behavior, or a furnace that powers on but never advances past the inducer stage.

• Specs: OEM Part Numbers: HK42FZ016 / 325878-751 | 24V control circuit compatible | Multi-speed blower control outputs | Integrated diagnostic LED fault code display | Factory-programmed timing sequences for GB1AAV048091AEJA
• OEM vs Generic: This is a genuine Carrier OEM board, factory-programmed with the exact timing delays, blower profiles, and safety lockout logic required for the GB1AAV048091AEJA. Aftermarket boards may use approximate timing, which can cause nuisance lockouts, premature heat exchanger wear, or voided equipment warranties.
• Install Difficulty: 3/5 — Shut off power and gas before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, smartphone or camera to document all wiring connections. Transfer wiring harnesses one at a time to avoid miswiring. Reset thermostat after installation and verify all stages on first call for heat.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship same business day from our warehouse when ordered before 3 PM EST.

Compatibility: Designed specifically for the Carrier GB1AAV048091AEJA gas furnace. Cross-references OEM part numbers HK42FZ016 and 325878-751 — both numbers describe the same board and kit assembly. Always confirm the part number on your existing board's label before ordering, as similar Carrier furnace models may use different IFC variants. Need fitment confirmation? Our HVAC parts specialists verify compatibility before your order ships — no guesswork required.