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OEM Carrier Transformer 40VA 120V/24V for GA1AAD036085ABJA
Carrier

OEM Carrier Transformer 40VA 120V/24V for GA1AAD036085ABJA

SKU: CARRIE-GA1AAD036085ABJA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit GA1AAD036085ABJA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer for Model GA1AAD036085ABJA

This is the factory OEM replacement transformer (part# HT01BC116) for the Carrier GA1AAD036085ABJA packaged gas/electric unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and you may blow the low-voltage fuse repeatedly. Replacing it is often the fastest and most affordable fix for a completely unresponsive HVAC system.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched for Carrier GA1AAD036085ABJA control circuit demands
  • OEM vs Generic: This OEM unit is wound to exact VA and voltage specifications. Undersized or off-tolerance generic transformers overheat under full control-circuit load, causing nuisance fuse failures and premature board damage — a false economy on a critical safety component.
  • Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flat-head and Phillips screwdrivers, wire nuts or quick-connect terminals, multimeter to confirm 24V output after installation. Label or photograph all wiring before disconnecting the old unit.
  • Warranty: 1-year OEM factory warranty. In-stock and ships the same business day from our warehouse.

Compatibility: Designed for the Carrier GA1AAD036085ABJA packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering to confirm fitment. Not sure if this is your part? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.

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 GA1AAD036085ABJA?
Yes. This is the factory-specified OEM transformer for the Carrier GA1AAD036085ABJA. 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 GA1AAD036085ABJA?
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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