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OEM Carrier 40VA Transformer 120V-24V for GB1AAV048135AGJA
Carrier

OEM Carrier 40VA Transformer 120V-24V for GB1AAV048135AGJA

SKU: CARRIE-GB1AAV048135AGJA-TRANSFORMER-HT01CN001 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01CN001 for Model GB1AAV048135AGJA

This is the factory OEM replacement transformer (part number HT01CN001) for the Carrier GB1AAV048135AGJA gas furnace. The transformer is the backbone of your furnace's low-voltage control circuit, stepping down 120V line voltage to 24VAC to power the thermostat, control board, gas valve, and all safety circuits. When this component fails, nothing in the system responds — the thermostat goes blank, the furnace won't call for heat, and no status codes appear on the control board. A failed transformer is often misdiagnosed as a bad control board, so always test the secondary output (should read 24–28VAC) before replacing larger components.

  • Specs: 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01CN001 | Factory-matched for Carrier GB1AAV048135AGJA
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or out-of-tolerance generic units can cause nuisance tripping of the 3A fuse, erratic board behavior, or premature failure of the gas valve coil.
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter, wire nuts or spade connectors. Label all wiring connections before removal. Verify secondary output with a multimeter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier GB1AAV048135AGJA gas furnace. Always confirm the 120V primary / 24V secondary / 40VA specification on your unit's data plate or existing transformer label before ordering. Our fitment team is available to verify compatibility before you purchase — ships today.

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 GB1AAV048135AGJA?
Yes. This is the factory-specified OEM transformer for the Carrier GB1AAV048135AGJA. 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 GB1AAV048135AGJA?
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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