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OEM Carrier Control Board HK42FZ034 for Model GA2AAD036055AAJA
Carrier

OEM Carrier Control Board HK42FZ034 for Model GA2AAD036055AAJA

SKU: carrier-control-board-ga2aad036055aaja Brand: Carrier
$189.95

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 HK42FZ034 for Model GA2AAD036055AAJA

The OEM Carrier control board (HK42FZ034) is the central controller of your Carrier GA2AAD036055AAJA gas furnace, governing ignition timing, blower and inducer operation, safety limits, and the full heating cycle. A failed board often shows up as no ignition, short-cycling, blinking diagnostic codes, or a furnace that ignores the thermostat. Installing a new board restores safe, automatic, code-correct operation. This factory-spec integrated furnace control is matched to the GA2AAD036055AAJA's sensor inputs and sequencing for plug-in compatibility and accurate self-diagnostics. Installation is moderate—plan 30 to 45 minutes. Power down the furnace, transfer each wiring harness one at a time to avoid mistakes, replicate any DIP-switch settings from the original, and confirm flame-sense and limit connections. Always shut off power and gas before servicing. Genuine OEM delivers the correct firmware and timing generic boards can't promise. In stock and ships same-day when ordered before 3PM CST. Order now to restore reliable heat with a trusted factory replacement board.

Compatibility

This part is compatible with Carrier model GA2AAD036055AAJA.

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 GA2AAD036055AAJA?
Yes. This is the factory-specified OEM control board for the Carrier Model GA2AAD036055AAJA. 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 GA2AAD036055AAJA?
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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