OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model GB3AAV060135AGJA

This is the factory OEM integrated furnace control (IFC) board — part numbers HK42FZ016 and 325878-751 — designed as the direct replacement for the Carrier GB3AAV060135AGJA gas furnace. The control board is the brain of your furnace: it sequences the inducer motor, igniter, gas valve, and blower in precise timing to ensure safe, efficient operation. When the board fails, symptoms include a furnace stuck in lockout, failure to initiate the ignition sequence, erratic blower behavior, or a completely unresponsive unit even with thermostat demand present. Fault codes flashed on the board's LED indicator are your first diagnostic clue — a failed board often displays continuous or non-standard blink patterns.

• Specs: OEM part numbers HK42FZ016 / 325878-751 | Integrated Furnace Control (IFC) board | 24V control circuit | Compatible with single-stage gas valve and HSI ignition system | Factory-matched logic timing for GB3AAV060135AGJA
• OEM vs Generic: OEM boards carry exact firmware, relay ratings, and component tolerances specified by Carrier engineering. Aftermarket boards may use off-spec relays or altered timing sequences that cause nuisance lockouts, void equipment warranties, or create unsafe operating conditions. For a safety-critical component like a control board, OEM is strongly recommended.
• Install difficulty: 3/5 — Requires comfort with low-voltage wiring and photographing all connector positions before removal. Tools needed: Phillips and flat-head screwdrivers, needle-nose pliers, phone or camera for wiring documentation, and a multimeter to verify 24V transformer output before installing the new board. Power down and lock out the furnace at the disconnect and breaker before beginning.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled parts warehouse.

Compatibility: This board is factory-specified for the Carrier GB3AAV060135AGJA 80% AFUE gas furnace. Cross-reference your existing board's part number (HK42FZ016 or 325878-751) against your unit's data plate to confirm fitment before ordering. Carrier part numbers may also appear on a label affixed to the original board. Not sure if this is the right part? Our HVAC parts specialists verify fitment before every order — contact us and we'll confirm compatibility fast.