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Carrier

OEM Carrier Control Board HK42FZ035 for Model FA4CNC042008AAAA

SKU: carrier-control-board-fa4cnc042008aaaa Brand: Carrier
$149.95

Order before 3PM CST — ships same day.
Standard delivery 2-5 business days. Express options at checkout.

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OEM Carrier Control Board HK42FZ035 for Model FA4CNC042008AAAA

This genuine OEM Carrier control board (HK42FZ035) runs the core logic of your FA4CNC042008AAAA fan coil unit, coordinating blower timing, thermostat calls, and integrated safety functions. A failing board often shows up as a system that won't start, an unresponsive blower, flashing fault codes, or erratic on-off cycling. Built and programmed to Carrier's factory specifications, this authentic replacement is an exact match for the FA4CNC042008AAAA, so you skip the compatibility and reprogramming problems that plague universal boards. Installing the correct OEM board restores accurate fan control, proper sequencing, and the safety monitoring that safeguards your motor and heating elements. The job is rated moderate to advanced: most pros finish in 30 to 45 minutes by transferring connections one wire at a time — photograph the layout first and keep power off at the breaker. Because it's a true Carrier part, performance and fit are guaranteed straight out of the box. Place your order before 3PM CST and it ships the same day to get your system back online fast. Our team can confirm your board revision before purchase if needed.

Compatibility

This part is compatible with Carrier model FA4CNC042008AAAA.

Shipping

Same-day shipping before 3 PM CST. 30-day returns on uninstalled parts.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $75
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email support@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Control Board fit my Carrier Model FA4CNC042008AAAA?
Yes. This is the factory-specified OEM control board for the Carrier Model FA4CNC042008AAAA. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the control board on my Carrier Model FA4CNC042008AAAA?
Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.
My HVAC system is completely dead. What could be wrong?
Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.
Is this control board compatible with Bryant or Payne too?
Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Carrier control board?
OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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