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OEM Carrier Transformer 40VA 120V/24V for C50A902564
Carrier

OEM Carrier Transformer 40VA 120V/24V for C50A902564

SKU: CARRIE-C50A902564-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Transformer 40VA 120V/24V for Model C50A902564

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier C50A902564 commercial rooftop unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your entire control circuit — thermostat, contactors, control board, and safety switches. When this transformer fails, the result is typically complete system unresponsiveness: the thermostat goes dark, the unit will not start, and no control signals reach any component. A failed transformer is often misdiagnosed as a board failure, so always test secondary voltage (24V) at the transformer before replacing costlier components.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched impedance and thermal protection
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications required by the C50A902564 control board. Undersized or off-tolerance generic units can overload under peak demand, causing nuisance tripping or premature failure of downstream controls.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify 0V on primary leads before touching wiring. Label all control wires prior to disconnecting old unit.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C50A902564 commercial rooftop packaged unit using OEM part HT01BD702. Always confirm primary voltage and VA rating on your unit's data plate before ordering. Our fitment team is available to verify compatibility before you purchase — same-day shipping on all in-stock orders.

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 C50A902564?
Yes. This is the factory-specified OEM transformer for the Carrier C50A902564. 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 C50A902564?
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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