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OEM Carrier Transformer 40VA 120V/24V for C50A306064
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A306064

SKU: CARRIE-C50A306064-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 120V/24V for Model C50A306064

This is the factory OEM replacement control transformer (part number HT01BD702) for the Carrier C50A306064 commercial packaged unit. The transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and all safety switches. When this transformer fails, the system goes completely silent: the thermostat loses power, no calls for heating or cooling are processed, and the unit will not respond to any inputs. A failed transformer is often identified by a blown 3A fuse on the control board or a burned smell near the electrical panel.

  • Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD702 | Factory-matched for Carrier C50A306064
  • OEM vs Generic: This OEM transformer is wound to exact factory VA and impedance specifications. Generic replacements can under-deliver on VA capacity, causing nuisance fuse failures and unreliable control circuit performance — especially under high-load conditions with multiple accessories.
  • Install difficulty: 3/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Test incoming 120V and outgoing 24V with a multimeter to confirm the transformer is the failed component before replacing. Always replace the control board fuse if blown.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed and factory-specified for the Carrier C50A306064 commercial rooftop/packaged unit. Verify your unit's control circuit voltage and VA requirements on the data plate before ordering. Our HVAC parts specialists are available to confirm fitment — 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 $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 C50A306064?
Yes. This is the factory-specified OEM transformer for the Carrier C50A306064. 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 C50A306064?
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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