OEM Carrier Integrated Furnace Control Board HK42FZ034 for Model PG8MAA036045AFJA

This OEM Integrated Furnace Control (IFC) board is the factory-specified replacement for the Carrier PG8MAA036045AFJA gas furnace. The control board is the brain of your furnace — it sequences every stage of operation including inducer startup, hot surface ignition, gas valve activation, blower timing, and fault code diagnostics. When this board fails, symptoms range from a complete no-heat lockout and continuous fault code blinking to erratic ignition cycling, blower running continuously, or the furnace refusing to advance past the inducer stage.

• Specs: OEM Part Number HK42FZ034 | Integrated Furnace Control (IFC) board | 24V control circuit | Compatible with single-stage gas valve operation | Factory diagnostic LED fault code display
• OEM vs Generic: This is a genuine Carrier OEM board, programmed to exact factory timing sequences and safety thresholds. Aftermarket boards often use generic firmware that can alter blower-off delays, lockout retry counts, and pressure switch debounce timing — all of which affect comfort, efficiency, and safety.
• Install difficulty: 3/5 — Requires disconnecting line-voltage and low-voltage wiring harnesses. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone or camera to photograph all wiring connections before removal. Always shut off the furnace disconnect and gas supply before beginning. Verify all harness connectors click fully into place on reinstall.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Direct OEM replacement for Carrier model PG8MAA036045AFJA gas furnaces. Verify your existing board's part number on the board label or unit data plate before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — no guesswork required.