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OEM Carrier Transformer 40VA 120/24V for GB1AAV024065AGJA
Carrier

OEM Carrier Transformer 40VA 120/24V for GB1AAV024065AGJA

SKU: CARRIE-GB1AAV024065AGJA-TRANSFORMER-HT01CN001 Brand: Carrier
✓ Guaranteed to fit GB1AAV024065AGJA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V/24V for Model GB1AAV024065AGJA

This OEM Carrier transformer (part number HT01CN001) is the factory-specified replacement for the GB1AAV024065AGJA gas furnace. The transformer is the heart of the low-voltage control circuit — it steps down 120V line voltage to the 24V signal voltage required by the thermostat, control board, gas valve, and all other control-side components. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the furnace won't respond to any call for heat or cooling, and nothing turns on. It is one of the most commonly overlooked causes of a completely unresponsive system.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN001 | Factory-matched output for Carrier control circuits
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier control boards. Undersized or off-tolerance generic units can cause erratic thermostat behavior, nuisance tripping of the limit switch, or premature control board failure.
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter (to confirm 24V output after install), wire nuts or quick-connect terminals. Photograph all wiring before disconnecting the old unit.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed by 3PM local time ship same business day from our climate-controlled parts warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier GB1AAV024065AGJA gas furnace. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts specialists are available to verify fitment — contact us before you buy if you have any questions.

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 GB1AAV024065AGJA?
Yes. This is the factory-specified OEM transformer for the Carrier GB1AAV024065AGJA. 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 GB1AAV024065AGJA?
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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