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OEM Carrier Transformer 40VA 24V for C48A506064 — HT01BD702
Carrier

OEM Carrier Transformer 40VA 24V for C48A506064 — HT01BD702

SKU: CARRIE-C48A506064-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer for Model C48A506064 — Part# HT01BD702

This OEM control transformer is the factory-specified replacement for the Carrier C48A506064 packaged unit. The transformer steps down 120V line voltage to 24V AC to power the control circuit, including the thermostat, contactor coil, and all low-voltage safety controls. When this component fails, the entire control system goes dark — the thermostat loses power, the unit won't respond to any call for heating or cooling, and you may see a blown fuse on the control board. If nothing works and you've ruled out the thermostat, this transformer is the next component to test.

  • Specs: 40VA rating | 120V primary / 24V secondary | Factory OEM part number HT01BD702 | Engineered to meet original Carrier performance tolerances
  • OEM vs Generic: This is a genuine Carrier OEM transformer. Generic replacements may use undersized VA ratings or inferior insulation, leading to premature burnout under normal HVAC load cycles — especially in packaged units running in high-demand environments.
  • Install difficulty: 2/5 — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire labels or tape for identification. Photograph all wiring before removal. Reconnect primary and secondary leads carefully, matching wire colors and terminals exactly.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our HVAC parts warehouse.

Compatibility: Designed for the Carrier C48A506064 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltage on the data plate or old component label before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions. In stock and ready to ship today.

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 C48A506064 — HT01BD702?
Yes. This is the factory-specified OEM transformer for the Carrier C48A506064 — HT01BD702. 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 C48A506064 — HT01BD702?
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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