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OEM Carrier Transformer 40VA 120V/24V for C48A406064
Carrier

OEM Carrier Transformer 40VA 120V/24V for C48A406064

SKU: CARRIE-C48A406064-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 C48A406064

This OEM replacement transformer (part number HT01BD702) is the factory-specified control circuit transformer for the Carrier C48A406064 packaged unit. The transformer steps down 120V line voltage to the 24V signal used by the thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, the entire control system goes dark — the thermostat loses power, the unit won't respond to any call for heating or cooling, and no fault codes are displayed because the board itself has no power.

  • Specs: Primary: 120V AC | Secondary: 24V AC | 40VA rated | OEM part number HT01BD702 | Factory-matched for Carrier C48A406064 packaged systems
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications. Undersized or off-tolerance generic transformers can overload under peak demand, blow the control fuse, or fail to hold the contactor coil closed — leaving you with an intermittent or repeat-failure diagnosis.
  • Install difficulty: 2/5 — Shut off power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Label or photograph all wire connections before removing the old unit.
  • Warranty: 1-year OEM factory warranty. Pulled from authorized Carrier distributor stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C48A406064 packaged rooftop/ground-mount unit. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating on your unit's data plate or wiring diagram before ordering. Our HVAC parts team is available to confirm fitment prior to purchase — order today for same-day shipping.

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 C48A406064?
Yes. This is the factory-specified OEM transformer for the Carrier C48A406064. 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 C48A406064?
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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