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OEM Carrier 40VA 120V to 24V Transformer for C48A202552 | National HVAC Parts
Carrier

OEM Carrier 40VA 120V to 24V Transformer for C48A202552 | National HVAC Parts

SKU: CARRIE-C48A202552-TRANSFORMER-HT01BD236 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD236 for Model C48A202552

This OEM step-down transformer is the factory-specified replacement for the Carrier C48A202552 packaged unit. The transformer converts 120V line voltage to the 24V signal required to power the control board, thermostat, contactor coil, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dead — your thermostat will show no response, the system will not call for heating or cooling, and no error codes will be generated because there is no power to the board to produce them.

  • Specs: 40VA capacity | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched transformer designed for Carrier packaged unit electrical loads
  • OEM vs Generic: OEM transformers are wound to exact VA specifications for the C48A202552 control circuit. Undersized or off-tolerance generic units can overheat under peak switching loads, causing nuisance trips or secondary failures in the contactor coil and control board.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter to confirm 24V output after installation. Always label low-voltage wiring before disconnecting from board terminals.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier C48A202552 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering to ensure a correct fit. Our parts specialists are available to confirm fitment prior to purchase — order with confidence and get your system back online 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 C48A202552 | National HVAC Parts?
Yes. This is the factory-specified OEM transformer for the Carrier C48A202552 | 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 C48A202552 | 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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