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OEM Carrier Transformer 40VA 120V to 24V for C48A306051 — Ships Today
Carrier

OEM Carrier Transformer 40VA 120V to 24V for C48A306051 — Ships Today

SKU: CARRIE-C48A306051-TRANSFORMER-HT01BD236 Brand: Carrier
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OEM Carrier Control Transformer 40VA for Model C48A306051

This is the factory OEM replacement control transformer (part number HT01BD236) for the Carrier C48A306051 packaged unit. The transformer steps down line voltage from 120V to the 24V required by your thermostat, contactor coil, and all low-voltage control circuits. When the transformer fails, the entire control system loses power — the thermostat goes blank, the unit won't respond to any calls for heating or cooling, and nothing works. It is often the first component to inspect when a system is completely unresponsive.

  • Specs: 40VA rating | 120V primary input | 24V secondary output | OEM part number HT01BD236 | Factory-matched electrical specifications for reliable control circuit protection
  • OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact factory specifications, including proper VA sizing for the full low-voltage load of the C48A306051. Undersized or off-spec generic transformers can overheat, blow the secondary fuse repeatedly, or fail prematurely under full control circuit load.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Always verify 24V output at secondary terminals after installation before restoring full system power. Note any inline 3A or 5A fuse on the secondary — replace if blown.
  • Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C48A306051 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you purchase — same-day shipping 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 C48A306051 — Ships Today?
Yes. This is the factory-specified OEM transformer for the Carrier C48A306051 — 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 C48A306051 — 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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