What are the specs for this Transformer?

The correct replacement for Carrier model GB1AAV048111ADJA is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Carrier equipment which lists the model number GB1AAV048111ADJA.

Is this transformer compatible with Bryant or Payne systems too?

Many Carrier parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Carrier

OEM Carrier Transformer 40VA 120/24V for GB1AAV048111ADJA

Name: OEM Carrier Transformer 40VA 120/24V for GB1AAV048111ADJA
Brand: Carrier
SKU: CARRIE-GB1AAV048111ADJA-TRANSFORMER-HT01BC116
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-GB1AAV048111ADJA-TRANSFORMER-HT01BC116 Brand: Carrier

✓ Guaranteed to fit GB1AAV048111ADJA — or your money back. Terms

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OEM Carrier Control Transformer 40VA 120V/24V for Model GB1AAV048111ADJA

This OEM replacement transformer (part# HT01BC116) is the factory-specified step-down transformer for the Carrier GB1AAV048111ADJA packaged gas/electric unit. The transformer converts 120V line voltage down to the 24V signal voltage that powers your thermostat, control board, and all low-voltage control components. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, your system stops responding, and no heating or cooling function can operate. It is often the first component to check when absolutely nothing responds at the thermostat.

Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched output tolerance for reliable control circuit operation
OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA rating and insulation class. Generic transformers rated at nominal 40VA can under-perform under load, causing voltage sag that triggers nuisance lockouts and premature control board failures.
Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Photograph existing wiring connections before removing the old transformer. Verify 24V output at secondary terminals before closing the cabinet.
Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our climate-controlled parts warehouse.

Compatibility: Designed specifically for the Carrier GB1AAV048111ADJA packaged unit. Always verify your unit's data plate voltage requirements and confirm OEM part number HT01BC116 before ordering. Our parts specialists are available to confirm fitment — just reach out before you buy. Order today and your part ships same business day.

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

OEM Carrier Transformer 40VA 120...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier GB1AAV048111ADJA?

Yes. This is the factory-specified OEM transformer for the Carrier GB1AAV048111ADJA. 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 GB1AAV048111ADJA?

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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OEM Carrier Transformer 40VA 120/24V for GB1AAV048111ADJA

OEM Carrier Control Transformer 40VA 120V/24V for Model GB1AAV048111ADJA

Shipping Information

Return Policy

Frequently Asked Questions