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OEM Carrier 40VA Transformer 120V–24V for GB1AAV036065AGJA
Carrier

OEM Carrier 40VA Transformer 120V–24V for GB1AAV036065AGJA

SKU: CARRIE-GB1AAV036065AGJA-TRANSFORMER-HT01CN001 Brand: Carrier
✓ Guaranteed to fit GB1AAV036065AGJA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer for Model GB1AAV036065AGJA

This OEM replacement transformer (part# HT01CN001) is the factory-specified control transformer for the Carrier GB1AAV036065AGJA gas furnace. The transformer steps down 120V line voltage to 24V to power the control circuit, thermostat, and all low-voltage components. When this part fails, the entire system becomes unresponsive — the thermostat goes blank, the furnace won't fire, and no error codes are produced because the control board itself has lost power. If your system is completely dead with no response from the thermostat, a failed transformer is the first thing to check.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01CN001 | Factory-matched output for reliable control circuit operation
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for the Carrier GB1AAV036065AGJA control board. Generic units may undervolt the circuit under load, causing intermittent lockouts, nuisance trips, or premature control board failure.
  • Install difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching wiring). Photograph all low-voltage wiring connections before disconnecting. Transformer mounts to the blower compartment panel and connects to the main harness in minutes.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier GB1AAV036065AGJA gas furnace. Verify your unit's data plate shows 120V/24V control circuit and cross-reference OEM part number HT01CN001 before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — no guesswork, no returns.

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 GB1AAV036065AGJA?
Yes. This is the factory-specified OEM transformer for the Carrier GB1AAV036065AGJA. 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 GB1AAV036065AGJA?
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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