OEM Carrier Integrated Furnace Control Board HK42FZ016 / 325878-751 for Model PG8DAA024070ADJA

This OEM integrated furnace control board (IFC) is the factory-specified replacement for the Carrier PG8DAA024070ADJA gas furnace. Originally supplied as HK42FZ016 and superseded by the updated kit 325878-751, this microprocessor-based board orchestrates every critical function of your furnace — from inducer startup and hot surface ignition sequencing to blower motor timing, gas valve control, and fault-code diagnostics. When it fails, symptoms include a complete no-heat lockout, furnace starting and immediately shutting down, erratic blower behavior, or a solid/flashing LED fault code with no call-for-heat response.

• Specs: Input range 98–132 VAC at 60 Hz | Ignitor output: 5A at 120 VAC | Cool blower: 30A / 2 HP / 240 VAC | Heat blower: 5A / 1/2 HP / 240 VAC | Inducer motor: 4A (FLA), 8.0A (LRA) at 120 VAC | Compatible with 24 VAC standard thermostat
• OEM vs Generic: The OEM 325878-751 kit ships with factory adapter harnesses for plug-and-play installation, eliminating splicing. Generic boards omit these harnesses, lack factory-calibrated timing sequences, and can introduce nuisance lockouts or unsafe ignition delays.
• Install difficulty: 3/5 — Shut off gas supply and 120V power at the disconnect before starting. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone/camera to photograph all wiring before disconnecting. Static discharge caution required — handle board by edges only. Typical install time: 45–75 minutes.
• Warranty: 1-year OEM factory warranty on new board. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for Carrier PG8DAA024070ADJA single-stage gas furnaces. Part number 325878-751 is the current OEM successor to HK42FZ016 and includes adapter plug harnesses for legacy wiring configurations. Verify your existing board's part number on the label before ordering — fits fixed-speed Carrier, Bryant, and Payne furnace platforms sharing the HK42FZ series IFC. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — same-day shipping available.