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OEM Carrier Control Board HK42FZ034 for Model GB3AAV036070ADJA
Carrier

OEM Carrier Control Board HK42FZ034 for Model GB3AAV036070ADJA

SKU: carrier-control-board-gb3aav036070adja 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 GB3AAV036070ADJA

This genuine OEM Carrier furnace control board (HK42FZ034) governs every step of your heating cycle — ignition sequencing, inducer and blower timing, safety lockouts, and onboard diagnostic codes. When the board fails you may see no response to a heat call, a blower that runs continuously or not at all, repeated short-cycling, or blinking fault lights. This board is pin-matched and programmed for the Carrier GB3AAV036070ADJA gas furnace, restoring proper relay logic and safety operation without guesswork. Difficulty is moderate, around 30-45 minutes: take a clear photo of the wiring, kill power at the disconnect, move each connector one at a time to the new board, and confirm the part number and any jumper settings match the original. The numerous low-voltage connections make careful labeling the difference between a smooth swap and a headache. A new board brings the furnace fully back to life and clears nuisance faults. In stock and ships same-day when ordered before 3PM CST, cutting your no-heat downtime.

Compatibility

This part is compatible with Carrier model GB3AAV036070ADJA.

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 GB3AAV036070ADJA?
Yes. This is the factory-specified OEM control board for the Carrier Model GB3AAV036070ADJA. 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 GB3AAV036070ADJA?
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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