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OEM Carrier 40VA 120V to 24V Control Transformer for C48A402762 | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C48A402762 | National HVAC Parts

SKU: CARRIE-C48A402762-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer for Model C48A402762

This OEM control transformer is the factory-specified replacement for the Carrier C48A402762 packaged unit. The transformer steps down line voltage (120V) to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and safety switches. When this component fails, the entire control circuit goes dark: the thermostat display may go blank, the system will not respond to any call for heating or cooling, and no safety or status LEDs will illuminate on the control board. OEM part numbers HT01BD236 and HT01BD702 are both factory-authorized replacements for this application.

  • Specs: 40VA output | Primary: 120V AC | Secondary: 24V AC | Color-coded lead wires | Factory-matched to Carrier C48A402762 control circuit requirements
  • OEM vs Generic: OEM transformers use factory-wound cores matched to the exact VA load of your system's control circuit. Undersized or off-spec generic units can overheat, trip thermal cutoffs prematurely, or fail to sustain voltage under full relay load — causing erratic system behavior.
  • Install difficulty: 2/5 — Shut off all power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to confirm 24V output after install). Photograph or label all wiring connections before removing the old transformer.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C48A402762 packaged unit. Replaces OEM part numbers HT01BD236 and HT01BD702. Confirm primary voltage and VA rating on your unit's data plate before ordering. Not sure it fits? Our parts specialists verify fitment before you buy — reach out before placing your order.

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 C48A402762 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A402762 | 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 C48A402762 | 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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Mike Rivera
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