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OEM Carrier Transformer 40VA 120/24V for GB1AAV036045AGJA
Carrier

OEM Carrier Transformer 40VA 120/24V for GB1AAV036045AGJA

SKU: CARRIE-GB1AAV036045AGJA-TRANSFORMER-HT01CN001 Brand: Carrier

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 40VA Control Transformer for Model GB1AAV036045AGJA

This is the factory OEM replacement control transformer (part# HT01CN001) for the Carrier GB1AAV036045AGJA gas furnace. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, control board, gas valve, and contactor coil. When it fails, the entire control circuit goes dark: the thermostat display goes blank, the system refuses to respond to any call for heat or cooling, and you may detect a burning or overheated odor near the air handler cabinet.

  • Specs: 40VA rating | 120V primary / 24V secondary | Factory OEM part number HT01CN001 | Matches original mounting footprint and terminal configuration for direct drop-in replacement
  • OEM vs Generic: OEM transformers from Carrier are wound to exact VA tolerances, ensuring the 24V control circuit maintains stable voltage under full load. Generic alternatives frequently run undervoltage, causing nuisance lockouts, contactor chatter, and premature control board failure.
  • Install difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting. Verify transformer output reads 24–28V AC after reinstallation.
  • Warranty: 1-year OEM factory warranty against defects. In stock and ships the same business day from our HVAC-dedicated warehouse.

Compatibility: Designed specifically for the Carrier GB1AAV036045AGJA gas furnace. Verify your existing transformer's VA rating and primary/secondary voltage on the data plate or old transformer label before ordering — mismatched VA ratings can damage the control board. Need fitment confirmation? Our parts team is available to verify compatibility before you buy.

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

Frequently Asked Questions

Does this Transformer fit my Carrier GB1AAV036045AGJA?
Yes. This is the factory-specified OEM transformer for the Carrier GB1AAV036045AGJA. 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 GB1AAV036045AGJA?
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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