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OEM Carrier Transformer 40VA 120V/24V for C48A602564
Carrier

OEM Carrier Transformer 40VA 120V/24V for C48A602564

SKU: CARRIE-C48A602564-TRANSFORMER-HT01BD702 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 120V to 24V for Model C48A602564

This is the factory-specified OEM replacement control transformer (part number HT01BD702) for the Carrier C48A602564 packaged unit. The transformer steps down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control circuits. When this part fails, the entire control circuit goes dead — the thermostat displays nothing, the system refuses to respond to any call for heating or cooling, and often a fuse or breaker may appear blown. It is one of the most overlooked yet critical components in any HVAC system.

  • Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM part number HT01BD702 | Designed for continuous-duty control circuit operation
  • OEM vs Generic: OEM transformers are wound and insulated to exact factory specifications, ensuring stable 24V output under full load. Generic units frequently produce voltage sag under load, causing erratic board behavior, nuisance lockouts, and premature contactor coil failure.
  • Install difficulty: 2/5 — Disconnect all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify 24V output on secondary terminals with a multimeter after installation before closing the panel.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our NationalHVACParts.com warehouse when ordered before 3PM local time.

Compatibility: Engineered as a direct OEM replacement for the Carrier C48A602564 packaged unit. Always confirm your unit's data plate voltage requirements match 120V primary / 24V secondary 40VA before ordering. Not sure it fits? Our HVAC parts specialists verify fitment at no charge — contact us before you order.

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 C48A602564?
Yes. This is the factory-specified OEM transformer for the Carrier C48A602564. 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 C48A602564?
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
HVAC Parts Specialist — Online