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OEM Carrier Transformer 40VA 120V/24V for LC748LCCSRMP2600
Carrier

OEM Carrier Transformer 40VA 120V/24V for LC748LCCSRMP2600

SKU: CARRIE-LC748LCCSRMP2600-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V/24V for Model LC748LCCSRMP2600

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier LC748LCCSRMP2600. The control transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, control board, contactor coil, and safety switches. When it fails, the result is total control system shutdown: the thermostat goes blank, the system won't respond to calls for heating or cooling, and no low-voltage components receive power. A failed transformer is often misdiagnosed as a control board failure, making this an important first diagnostic check.

  • Specs: Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01BD702 | Factory-matched impedance and thermal overload protection
  • OEM vs Generic: This OEM unit is wound to exact Carrier factory specifications, ensuring stable 24V output under full load. Generic transformers can sag under load, causing intermittent lockouts, nuisance tripping, and premature control board failure.
  • Install Difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 24V output with a meter after installation before restoring system operation. Always label wires before disconnecting.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier LC748LCCSRMP2600. Verify transformer VA rating and primary/secondary voltages on your unit's data plate before ordering. If you're unsure of fitment, our team is available to confirm compatibility before you buy — orders placed before 3 PM ship the 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 $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 LC748LCCSRMP2600?
Yes. This is the factory-specified OEM transformer for the Carrier LC748LCCSRMP2600. 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 LC748LCCSRMP2600?
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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