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OEM Carrier Transformer 40VA 120V to 24V Control Transformer for C48A302761 | National HVAC Parts
Carrier

OEM Carrier Transformer 40VA 120V to 24V Control Transformer for C48A302761 | National HVAC Parts

SKU: CARRIE-C48A302761-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD236 for Model C48A302761

This OEM Carrier transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C48A302761 packaged unit. The transformer is the backbone of your system's low-voltage control circuit, stepping 120V line voltage down to the 24V signal voltage required by your thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire control circuit goes dead — no thermostat response, no contactor click, nothing starts. If you're getting 120V in but zero 24V output, this transformer is the most likely culprit.

  • Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Factory-matched OEM replacement for part number HT01BD236
  • OEM vs Generic: This OEM unit is wound to exact factory VA and voltage tolerances, ensuring proper inrush current handling during contactor pulls. Undersized or off-tolerance generic transformers can overheat and trip their internal thermal cutout, causing intermittent no-start conditions that are difficult to diagnose.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts or push-in connectors. Label all low-voltage wiring before disconnecting. Verify 120V input and 24V output with a multimeter after installation before closing the panel.
  • Warranty: 1-year OEM factory warranty. Orders received by 3 PM ship same business day from our warehouse.

Compatibility: Fits Carrier model C48A302761 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.

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 C48A302761 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A302761 | 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 C48A302761 | 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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