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Carrier

OEM Carrier Control Board HK42FZ Series for Model FB4ASA042000AAAA

SKU: carrier-control-board-fb4asa042000aaaa Brand: Carrier
$186.95

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 HK42FZ Series for Model FB4ASA042000AAAA

This OEM Carrier control board (HK42FZ-compatible series) is the integrated furnace control module that manages blower operation, fan timing, and safety interlocks in your Carrier FB4ASA042000AAAA fan coil air handler. It coordinates signals between the thermostat, blower motor, and electric heat elements, ensuring proper sequencing and protecting the system from fault conditions. A failing board often causes no-heat, no-fan, or intermittent operation. This direct-replacement part is engineered to factory specifications for an exact fit and reliable performance with your specific unit. Installation is moderate difficulty and best handled by an HVAC professional: power down the unit, photograph the wiring, transfer connectors to the matching terminals, and secure the board to the original standoffs. No reprogramming required. Always confirm the part number printed on your existing board before ordering. In stock and ships same-day when you order before 3PM CST, so you can get your air handler back online fast. Backed by genuine OEM quality for long-term durability and peace of mind.

Compatibility

This part is compatible with Carrier model FB4ASA042000AAAA.

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 FB4ASA042000AAAA?
Yes. This is the factory-specified OEM control board for the Carrier Model FB4ASA042000AAAA. 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 FB4ASA042000AAAA?
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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