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OEM Carrier 40VA Transformer 120V-24V for GB3AAV036050AFJA
Carrier

OEM Carrier 40VA Transformer 120V-24V for GB3AAV036050AFJA

SKU: CARRIE-GB3AAV036050AFJA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit GB3AAV036050AFJA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer 120V/24V for Model GB3AAV036050AFJA

This is the factory OEM replacement control transformer (part number HT01BC116) for the Carrier GB3AAV036050AFJA packaged gas/electric unit. The transformer steps down line voltage from 120V to the 24V AC signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any calls for heating or cooling, and no components will energize. It is one of the first components to check when nothing in the system responds.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched terminal configuration for direct drop-in replacement
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic transformers often run undersized VA, causing overheating under full control-circuit load and premature failure — especially on multi-stage systems drawing current from multiple zones or accessories.
  • Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output at secondary terminals before closing the cabinet.
  • Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier GB3AAV036050AFJA packaged unit. Always verify the primary voltage (120V) and VA rating on your existing transformer's data label before ordering. If you are unsure of fitment, our technical team is available to confirm compatibility before you purchase — same-day shipping on all in-stock orders.

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 Transformer fit my Carrier GB3AAV036050AFJA?
Yes. This is the factory-specified OEM transformer for the Carrier GB3AAV036050AFJA. 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 transformer on my Carrier GB3AAV036050AFJA?
Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.
My thermostat has no power. What failed?
Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.
Is this transformer 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 transformer?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
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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Mike Rivera
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