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OEM Carrier Transformer 40VA 120V/24V for C48A902564
Carrier

OEM Carrier Transformer 40VA 120V/24V for C48A902564

SKU: CARRIE-C48A902564-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD702 for Model C48A902564

This OEM step-down transformer (part number HT01BD702) is the factory-specified replacement for the Carrier C48A902564 packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers your control board, thermostat, contactor coil, and every other low-voltage component in the system. When it fails, absolutely nothing works — the thermostat goes blank, the system won't respond to any call for heating or cooling, and you may find a blown fuse on the control board from a secondary-side short.

  • Specs: 40VA rating | 120V primary / 24V secondary | Class 2 rated | OEM part number HT01BD702 | Factory-matched impedance and thermal protection
  • OEM vs Generic: OEM transformers are wound to Carrier's exact VA and impedance spec, ensuring stable 24V output under full contactor-coil load. Undersized generic transformers sag under load, causing intermittent lockouts and nuisance tripped fuses.
  • Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always label or photograph wire connections before removing the old transformer.
  • Warranty: 1-year OEM factory warranty against defects. In-stock units ship the same business day from our warehouse.

Compatibility: Designed for the Carrier C48A902564 packaged unit. Confirm your existing transformer's primary voltage (120V) and VA rating (40VA) on the unit's data plate or the transformer label before ordering. If you are unsure of fitment, our HVAC parts specialists verify compatibility before you buy — no guesswork required. Order today 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 C48A902564?
Yes. This is the factory-specified OEM transformer for the Carrier C48A902564. 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 C48A902564?
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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