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OEM Carrier Transformer 40VA 120V/24V for C48A502761
Carrier

OEM Carrier Transformer 40VA 120V/24V for C48A502761

SKU: CARRIE-C48A502761-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C48A502761 — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD236 for Model C48A502761

This OEM Carrier control transformer (part number HT01BD236) is the factory-specified replacement for the C48A502761 packaged unit. The transformer steps line voltage (120V) down to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the system goes completely unresponsive: the thermostat goes blank, the unit won't energize, and no heating or cooling operation is possible.

  • Specs: 40VA rated | Primary: 120V | Secondary: 24V | Factory OEM part number HT01BD236 | Designed for R-410A packaged unit control circuits
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the C48A502761 control board. Undersized or off-tolerance generic units can cause nuisance tripping, blown fuses, or premature control board failure.
  • Install difficulty: 2/5 — Shut off all power to the unit before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter to verify 24V output after installation. Label or photograph wiring connections before disconnecting the old unit.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for Carrier model C48A502761 packaged units. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Not sure if this part fits your unit? Our HVAC parts specialists confirm fitment before you buy — order with confidence.

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 C48A502761?
Yes. This is the factory-specified OEM transformer for the Carrier C48A502761. 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 C48A502761?
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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