What are the specs for this Transformer?

The correct replacement for Carrier model LC748LCCSRLY2600 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 LC748LCCSRLY2600.

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 40VA Transformer 120V–24V for LC748LCCSRLY2600

Name: OEM Carrier 40VA Transformer 120V–24V for LC748LCCSRLY2600
Brand: Carrier
SKU: CARRIE-LC748LCCSRLY2600-TRANSFORMER-HT01BD702
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-LC748LCCSRLY2600-TRANSFORMER-HT01BD702 Brand: Carrier

✓ Guaranteed to fit LC748LCCSRLY2600 — or your money back. Terms

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OEM Carrier 40VA Control Transformer 120V–24V for Model LC748LCCSRLY2600

This OEM replacement transformer (part number HT01BD702) is the factory-specified control circuit transformer for the Carrier LC748LCCSRLY2600. Its job is to step down the 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control wiring. When it fails, absolutely nothing in the control circuit responds — the thermostat goes blank, the system refuses to start, and no error codes appear because the board itself has no power to generate them.

Specs: Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01BD702 | Factory-matched impedance and thermal protection
OEM vs Generic: OEM transformers like HT01BD702 are wound to Carrier's exact VA rating and thermal cutoff spec. Undersized generic units can overheat under normal control-circuit load, triggering nuisance shutdowns or early failure — especially in multi-stage or zoned systems.
Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Photograph all low-voltage and line-voltage wiring connections before removing the old transformer.
Warranty: 1-year OEM factory warranty. Orders ship same business day from our climate-controlled warehouse.

Compatibility: Fits Carrier model LC748LCCSRLY2600. Always verify the input voltage, output voltage, and VA rating on your unit's data plate or existing transformer label before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — reach out with your full model and serial number and we'll confirm the correct part.

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 40VA Transformer 120...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier LC748LCCSRLY2600?

Yes. This is the factory-specified OEM transformer for the Carrier LC748LCCSRLY2600. 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 LC748LCCSRLY2600?

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 40VA Transformer 120V–24V for LC748LCCSRLY2600

OEM Carrier 40VA Control Transformer 120V–24V for Model LC748LCCSRLY2600

Shipping Information

Return Policy

Frequently Asked Questions