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OEM Carrier 40VA 120V to 24V Control Transformer for C48A406052 | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Control Transformer for C48A406052 | National HVAC Parts

SKU: CARRIE-C48A406052-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 120V/24V for Model C48A406052

This is the factory OEM replacement transformer (part number HT01BD236) designed specifically for the Carrier C48A406052 packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit, including your thermostat, contactor coil, and control board. When this part fails, the entire control system goes dark — you'll see a blank thermostat, no response to calls for heating or cooling, and potentially a tripped low-voltage fuse. It's often the first part to check when nothing works at all.

  • Specs: 40VA rating | Primary voltage: 120V | Secondary voltage: 24V | OEM part number HT01BD236 | Factory-matched for Carrier C48A406052 packaged units
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Generic units can run under-rated VA, causing overheating, nuisance tripping, and premature control board failure — a much more expensive repair.
  • Install difficulty: 2/5 — Shut off all power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before removal. Verify fuse on secondary side before condemning the transformer.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier C48A406052 packaged unit. Confirm primary and secondary voltage ratings on your existing transformer's data label before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — order with confidence and get back up and running 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 $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 C48A406052 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A406052 | 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 C48A406052 | 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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