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OEM Carrier Transformer 40VA 120V-24V for LC748LCCSRMPX2600
Carrier

OEM Carrier Transformer 40VA 120V-24V for LC748LCCSRMPX2600

SKU: CARRIE-LC748LCCSRMPX2600-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model LC748LCCSRMPX2600

This OEM Carrier transformer (part number HT01BD702) is the factory-specified replacement for the LC748LCCSRMPX2600 unit. The control transformer steps down line voltage (120V) to low-voltage 24V AC to power the entire control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the system goes completely silent: no thermostat response, no fan, no heating or cooling. It is one of the first components to check when nothing in the system responds.

  • Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01BD702 | Factory-matched output for Carrier control circuits
  • OEM vs Generic: The OEM HT01BD702 transformer delivers a stable, regulated 24V output within tight tolerances. Off-brand transformers frequently output slightly high or low voltage, causing nuisance lockouts, control board errors, and premature relay failure.
  • Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label or photograph all wiring connections before removal.
  • Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse.

Compatibility: Engineered for the Carrier model LC748LCCSRMPX2600. Always confirm primary voltage (120V) and VA rating on your unit's data plate before ordering. If you are unsure of fitment, our HVAC parts specialists are available to verify compatibility before you purchase — 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 $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 LC748LCCSRMPX2600?
Yes. This is the factory-specified OEM transformer for the Carrier LC748LCCSRMPX2600. 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 LC748LCCSRMPX2600?
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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