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OEM Carrier Transformer 40VA 120V to 24V for C48A403552 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C48A403552 — Ships Today

SKU: CARRIE-C48A403552-TRANSFORMER-HT01BD236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 120V/24V for Model C48A403552

This OEM replacement control transformer (part number HT01BD236) is the factory-specified unit for the Carrier C48A403552 packaged system. The transformer steps down line voltage from 120V to the 24V signal voltage required to power the control board, thermostat, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system will not respond to any calls for heating or cooling, and no low-voltage components will function.

  • Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD236 | Factory-matched output tolerance for stable control circuit operation
  • OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage specifications, ensuring reliable 24V output under full control circuit load. Generic units often underperform at rated VA, causing nuisance tripping of internal thermal protection and intermittent control failures.
  • Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output post-install. Label or photograph all low-voltage wiring connections before removing the old transformer.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders ship same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier C48A403552 packaged unit. Always verify your existing transformer's primary/secondary voltage and VA rating from the unit data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence and get back to comfort 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 $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 C48A403552 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C48A403552 — Ships Today. 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 C48A403552 — Ships Today?
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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