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OEM Carrier Transformer 40VA 120V/24V for GA1AAD042070ABJA
Carrier

OEM Carrier Transformer 40VA 120V/24V for GA1AAD042070ABJA

SKU: CARRIE-GA1AAD042070ABJA-TRANSFORMER-HT01BC116 Brand: Carrier

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model GA1AAD042070ABJA

This is the factory OEM replacement control transformer (part number HT01BC116) for the Carrier GA1AAD042070ABJA packaged gas/electric unit. The transformer steps down 120V line voltage to the 24V signal required to power your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control circuit loses power — your thermostat goes blank, the system won't respond to any call for heating or cooling, and nothing works despite the unit having line voltage present.

  • Specs: 40VA rated | 120V primary / 24V secondary | Factory OEM part number HT01BC116 | Replaces worn or shorted transformers causing complete control circuit failure
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class, ensuring the 24V secondary holds steady under full control-circuit load. Generic transformers rated at nominal 40VA often sag under peak demand, causing intermittent lockouts and nuisance trips on sensitive control boards.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before removal. Confirm 24V output with a multimeter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier GA1AAD042070ABJA packaged unit. Cross-reference OEM part number HT01BC116 against your unit's data plate and wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists verify compatibility before your order ships — no guesswork required.

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 GA1AAD042070ABJA?
Yes. This is the factory-specified OEM transformer for the Carrier GA1AAD042070ABJA. 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 GA1AAD042070ABJA?
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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