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OEM Carrier Transformer 40VA 120V/24V for C50A302051
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A302051

SKU: CARRIE-C50A302051-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit C50A302051 — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD236 for Model C50A302051

This OEM replacement transformer (part number HT01BD236) is the factory-specified control transformer for the Carrier C50A302051 commercial rooftop unit. Its sole job is stepping line voltage (120V) down to 24V AC to power the low-voltage control circuit — thermostats, relays, contactors, and the control board all depend on it. When this transformer fails, absolutely nothing works: no call for cooling, no call for heat, no fan — the system goes completely silent and unresponsive at the thermostat.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V AC | Class 2 control transformer | Direct OEM replacement for part number HT01BD236
  • OEM vs Generic: The OEM transformer is wound to exact VA and impedance specs for the Carrier C50A302051 control board. Undersized or off-tolerance aftermarket transformers can cause erratic control behavior, nuisance tripping, or premature board failure — OEM is the only safe choice for a commercial application.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after install. Always label and photograph wire connections before disconnecting the old unit.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse stock.

Compatibility: Confirmed fit for Carrier model C50A302051 commercial packaged rooftop unit. Verify primary voltage (120V) on your unit's data plate before ordering — some rooftop configurations use 208/240V primary transformers and will require a different part. Our technical team is available to confirm fitment before you order. In stock and 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 $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 C50A302051?
Yes. This is the factory-specified OEM transformer for the Carrier C50A302051. 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 C50A302051?
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
HVAC Parts Specialist — Online