What are the specs for this Transformer?

The correct replacement for Carrier model GB1AAV042091ADJA 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 GB1AAV042091ADJA.

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 120V-24V for GB1AAV042091ADJA

Name: OEM Carrier Transformer 40VA 120V-24V for GB1AAV042091ADJA
Brand: Carrier
SKU: CARRIE-GB1AAV042091ADJA-TRANSFORMER-HT01BC116
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-GB1AAV042091ADJA-TRANSFORMER-HT01BC116 Brand: Carrier

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OEM Carrier 40VA Control Transformer HT01BC116 for Model GB1AAV042091ADJA

This OEM step-down transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GB1AAV042091ADJA gas furnace. The control transformer converts 120V line voltage to 24V AC, powering the thermostat, gas valve, control board, and all low-voltage control circuits throughout the system. When this component fails, the entire control circuit goes dead — the thermostat displays nothing, the furnace won't fire, and no components respond. It is often the first component to diagnose when a system is completely unresponsive despite having line power confirmed at the unit.

Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01BC116 | Factory-matched output tolerances for stable low-voltage operation
OEM vs Generic: The OEM HT01BC116 is wound to Carrier's exact VA and voltage specifications, ensuring stable 24V output under full load. Undersized or off-tolerance generic transformers can cause erratic board behavior, nuisance lockouts, and premature control board failure.
Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter. Label or photograph all wire connections before removal. Replacement typically takes 20–30 minutes.
Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier GB1AAV042091ADJA gas furnace. Verify OEM part number HT01BC116 and transformer VA/voltage ratings on your unit's data plate or existing transformer label before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before you order — no guesswork, no returns.

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 GB1AAV042091ADJA?

Yes. This is the factory-specified OEM transformer for the Carrier GB1AAV042091ADJA. 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 GB1AAV042091ADJA?

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 120V-24V for GB1AAV042091ADJA

OEM Carrier 40VA Control Transformer HT01BC116 for Model GB1AAV042091ADJA

Shipping Information

Return Policy

Frequently Asked Questions