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OEM Carrier Transformer 40VA 120V-24V for C50A604064
Carrier

OEM Carrier Transformer 40VA 120V-24V for C50A604064

SKU: CARRIE-C50A604064-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Circuit Transformer for Model C50A604064

This OEM replacement transformer (part number HT01BD702) is the factory-specified step-down transformer for the Carrier C50A604064 commercial packaged rooftop unit. The transformer converts 120V primary voltage to the 24V secondary voltage required to power the entire low-voltage control circuit — including the thermostat, contactor coils, and control board. When this component fails, the system goes completely unresponsive: no thermostat communication, no staging, no heat or cooling — nothing works at all.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD702 | Factory-matched output tolerance for reliable control circuit operation
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier C50A604064 control board. Undersized or off-tolerance generic units can cause nuisance tripping, erratic thermostat behavior, or premature control board failure.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify 24V output after installation before restoring full system power. Always label or photograph existing wiring prior to removal.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier C50A604064 commercial rooftop packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages from the unit data plate before ordering to ensure a correct fit. Our HVAC parts specialists are available to verify compatibility before you purchase — order with confidence and get back up and running fast.

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 C50A604064?
Yes. This is the factory-specified OEM transformer for the Carrier C50A604064. 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 C50A604064?
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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