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OEM Carrier Transformer 40VA 120V to 24V for C48A404064 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C48A404064 | National HVAC Parts

SKU: CARRIE-C48A404064-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V to 24V for Model C48A404064

This is the OEM factory-specified control transformer (part number HT01BD702) for the Carrier C48A404064 packaged unit. The transformer steps line voltage (120V) down to 24V AC to power the entire control circuit — including the thermostat, contactor coil, and control board. When this part fails, your system will appear completely dead: the thermostat goes blank, nothing responds to a call for cooling or heating, and no components energize. It is often the first part to check when a system shows zero control-circuit activity.

  • Specs: 40VA output | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched for Carrier C48A404064 packaged units
  • OEM vs Generic: This OEM transformer is wound and rated to exact factory specifications. Generic transformers often carry lower VA ratings or inferior insulation, risking premature burnout — especially under high-demand control circuits with multiple 24V loads.
  • Install Difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all wire connections before removing the old transformer. Always verify 24V output with a multimeter before reassembling the unit.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C48A404064 packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. Our fitment team is available to verify compatibility before you buy — order with confidence and get your system back online fast.

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 C48A404064 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A404064 | National HVAC Parts. 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 C48A404064 | National HVAC Parts?
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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