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OEM Carrier Fan Timer Control Board 20054502 — PG8HAA048100AAJA
Carrier

OEM Carrier Fan Timer Control Board 20054502 — PG8HAA048100AAJA

SKU: CARRIE-PG8HAA048100AAJA-CONTROL_BOARD-20054502 Brand: Carrier
✓ Guaranteed to fit PG8HAA048100AAJA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Fan Timer Control Board 20054502 for Model PG8HAA048100AAJA

This OEM fan timer control board is the factory-specified replacement for the Carrier PG8HAA048100AAJA gas furnace. Made by Honeywell for Carrier (OEM part ST9120C2010), this board manages the sequencing of the inducer motor, hot surface igniter, gas valve, and circulator blower — coordinating every stage of the heat and fan cycle. When this board fails, you may experience a furnace that won't ignite, a blower that runs continuously or not at all, erratic fan timing, or a system stuck in lockout with no fault codes displayed.

  • Specs: OEM Part # 20054502 | Honeywell ST9120C2010 | Fan Timer / Blower Control | Single-stage furnace application | 120V input | 24V control circuit | Replaces 20054501, ST9120A, ST9120B, ST9120C
  • OEM vs Generic: This is the genuine factory OEM board — not a third-party substitute. OEM boards are factory-programmed with exact fan-on/fan-off delays and fault logic matched to your Carrier furnace. Generic boards may use different timing profiles that can reduce efficiency, increase heat exchanger stress, or void remaining equipment warranties.
  • Install Difficulty: 3/5 — Requires shutting off 120V power and gas supply before beginning. Label all low-voltage wiring connections before removing the old board. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for pre/post testing. Note and transfer any DIP switch settings from the old board before installation.
  • Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PG8HAA048100AAJA gas furnace. This board is also cross-referenced to Ducane and Rheem applications using part 20054502. Always verify your existing board's part number against your unit's data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your furnace back online fast.

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 $99
  • 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 info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Control Board fit my Carrier OEM Carrier Fan Timer Control Board 20054502 — PG8HAA048100AAJA?
Yes. This is the factory-specified OEM control board for the Carrier OEM Carrier Fan Timer Control Board 20054502 — PG8HAA048100AAJA. 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 OEM Carrier Fan Timer Control Board 20054502 — PG8HAA048100AAJA?
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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