OEM Carrier Integrated Furnace Control Board HK42FZ016 for Model PG8UAA066111ABJA

This OEM integrated furnace control (IFC) board is the factory-specified replacement for the Carrier PG8UAA066111ABJA gas furnace. The IFC board is the brain of your heating system — it sequences every stage of the heating cycle, commanding the inducer motor, hot surface igniter, gas valve, and blower motor in precise order. When this board fails, symptoms include the furnace failing to start, going into hard lockout, the blower running continuously, or the system short-cycling with no heat. Diagnostic LED flash codes on the board itself help pinpoint the exact fault before and after replacement.

• Specs: 24 VAC control circuit | Input range: 98–132 VAC at 60 Hz | Igniter output: 5A at 120 VAC | Cool blower: 30A, 2 HP, 240 VAC | Heat blower: 5A, 1/2 HP, 240 VAC | Inducer motor: 4A, 120 VAC | Microprocessor-based with onboard LED fault diagnostics | OEM part numbers: HK42FZ016 / 325878-751
• OEM vs Generic: This is a genuine Carrier OEM board, factory-programmed and tested to exact sequencing tolerances for the PG8UAA066111ABJA. Third-party boards may use approximate timing logic that causes nuisance lockouts, premature igniter failure, or blower-off-delay drift — all of which shorten furnace lifespan and void remaining equipment warranties.
• Install difficulty: 3/5 — Disconnect power and gas before servicing. Photograph all wire harness connections before unplugging. The 325878-751 kit version includes adapter harnesses for older wiring configurations. Tools needed: 1/4" nut driver, needle-nose pliers, phone camera for documentation. Always clear any stored fault codes after installation and run a full heat cycle to confirm operation.
• Warranty: 1-year OEM manufacturer warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PG8UAA066111ABJA single-stage gas furnace. Also cross-references successor kit part number 325878-751 (includes adapter harnesses for legacy wiring). Verify your existing board's part number on the board label before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.