OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model GB3AAV036050AEJA

This is the factory OEM integrated furnace control (IFC) board for the Carrier GB3AAV036050AEJA gas furnace, sold under OEM part numbers HK42FZ016 and kit number 325878-751. The control board is the brain of your furnace — it sequences every stage of operation including inducer startup, igniter warm-up, gas valve activation, blower timing, and fault code diagnostics. When the IFC board fails, symptoms range from complete no-heat lockout and repeated ignition attempts to erratic blower behavior, unresponsive thermostat calls, or flashing diagnostic LED fault codes that point back to the board itself. Replacing with the correct OEM board ensures all timing delays, safety lockout thresholds, and blower speed profiles match the factory specifications for your unit.

• 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 | Includes diagnostic LED fault code indicator
• OEM vs Generic: OEM boards are programmed with factory-exact timing delays and lockout sequences specific to the GB3AAV036050AEJA. Aftermarket boards may use generic timing profiles that can void equipment warranties, cause nuisance lockouts, or fail to satisfy pressure switch and limit circuit sequencing correctly.
• Install Difficulty: 3/5 — Requires disconnecting 120V power and photographing all wiring harness connections before removal. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, phone or camera for wiring documentation. Capacitor discharge is not required, but always confirm power is off at the disconnect and breaker before handling. Transfer wiring connections one at a time to avoid mis-wiring.
• Warranty: 1-year OEM factory warranty on parts and workmanship. Orders placed before cutoff ship the same business day from our climate-controlled parts warehouse.

Compatibility: Engineered specifically for the Carrier GB3AAV036050AEJA gas furnace. Always cross-reference your existing board's part number label (HK42FZ016 or 325878-751) against your unit's data plate before ordering to confirm correct fitment. Have questions about compatibility? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.