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OEM Carrier Transformer 40VA 120V/24V for C50A402564
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A402564

SKU: CARRIE-C50A402564-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD702 for Model C50A402564

This is the factory OEM replacement control transformer for the Carrier C50A402564 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 coils, and control board. When it fails, absolutely nothing responds: the thermostat goes blank, the system won't energize, and no call for heating or cooling is answered. If you've ruled out a blown fuse and your 24V circuit is dead, this transformer is the most likely culprit.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD702 | Factory-matched to Carrier C50A402564 control circuit requirements
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the factory control board. Undersized or off-tolerance generic units can overload quickly under full control-circuit demand, leading to repeat failures and potential board damage.
  • Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Confirm primary and secondary voltages with a meter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse stock.

Compatibility: Designed for the Carrier C50A402564 commercial packaged unit. Always verify the existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment before you purchase — no guesswork required. Order now and ship 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 C50A402564?
Yes. This is the factory-specified OEM transformer for the Carrier C50A402564. 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 C50A402564?
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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