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OEM Carrier Transformer 40VA 120V/24V for C50A402752
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A402752

SKU: CARRIE-C50A402752-TRANSFORMER-HT01BD236 Brand: Carrier

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OEM Carrier 40VA Control Transformer HT01BD236 for Model C50A402752

This OEM control transformer (part number HT01BD236) is the factory-specified replacement for the Carrier C50A402752 commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coils, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — no thermostat response, no staging, no ignition sequence. If your unit is completely unresponsive despite having line voltage present, a failed transformer is one of the first components to test.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched for Carrier C50A402752 control circuit requirements
  • OEM vs Generic: OEM transformers are wound and potted to exact VA and impedance specifications. Undersized or off-spec generic transformers can overheat, trip their internal fuse repeatedly, or deliver unstable 24V output that causes nuisance lockouts and board damage.
  • Install difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Note wire color and terminal labeling before disconnecting. Verify 24V output after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C50A402752 commercial rooftop/packaged unit. Verify your existing transformer's VA rating, primary voltage (120V), and secondary voltage (24V) against your unit's wiring diagram before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions. Order now and your replacement transformer ships today.

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 C50A402752?
Yes. This is the factory-specified OEM transformer for the Carrier C50A402752. 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 C50A402752?
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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