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OEM Carrier 40VA 120V to 24V Control Transformer for C48A402752 (HT01BD236) | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C48A402752 (HT01BD236) | National HVAC Parts

SKU: CARRIE-C48A402752-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 120V/24V for Model C48A402752

This is the factory OEM replacement transformer (part# HT01BD236) designed for the Carrier C48A402752 packaged unit. The transformer steps down line voltage from 120V to the 24V AC required to power thermostats, contactors, control boards, and safety switches throughout the system. When this component fails, the entire control circuit goes dead — the thermostat loses power, the system will not respond to any call for heating or cooling, and nothing appears to happen when the unit is switched on. It is one of the first components to check when diagnosing a completely unresponsive HVAC system.

  • Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01BD236 | Factory-matched output voltage for reliable control circuit operation
  • OEM vs Generic: This OEM unit is wound to exact Carrier factory specifications, ensuring stable 24V output under full load. Generic transformers frequently under-deliver on VA rating, causing nuisance tripping of fuses and premature control board failures.
  • Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify 24V output with a multimeter after installation before restoring full system power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM drop-in replacement for Carrier C48A402752 packaged units. Always verify your existing transformer's primary/secondary voltage and VA rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you purchase — same-day shipping available on all in-stock orders.

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 $99
  • 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 C48A402752 (HT01BD236) | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A402752 (HT01BD236) | 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 C48A402752 (HT01BD236) | 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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