What are the specs for this Transformer?

The correct replacement for Carrier model C48A403564 — Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Carrier equipment which lists the model number C48A403564 — Ships Today.

Is this transformer compatible with Bryant or Payne systems too?

Many Carrier parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Carrier

OEM Carrier Transformer 40VA 120V to 24V for C48A403564 — Ships Today

Name: OEM Carrier Transformer 40VA 120V to 24V for C48A403564 — Ships Today
Brand: Carrier
SKU: CARRIE-C48A403564-TRANSFORMER-HT01BD702
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C48A403564-TRANSFORMER-HT01BD702 Brand: Carrier

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OEM Carrier 40VA Control Transformer for Model C48A403564

This OEM replacement control transformer (part# HT01BD702) is the factory-specified unit for the Carrier C48A403564 packaged unit. The transformer steps down 120V line voltage to the 24V AC signal required to power the thermostat, control board, contactor coil, and all low-voltage control circuits. When this component fails, the entire control circuit goes dark — your thermostat will appear dead, the system will not respond to any calls for heating or cooling, and no diagnostic LEDs will illuminate on the control board.

Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Direct OEM replacement for part# HT01BD702
OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can cause nuisance tripping of the built-in circuit breaker, erratic thermostat behavior, or premature control board failure.
Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before disconnecting the old transformer.
Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM fit for the Carrier C48A403564 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before your order ships.

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

OEM Carrier Transformer 40VA 120...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier C48A403564 — Ships Today?

Yes. This is the factory-specified OEM transformer for the Carrier C48A403564 — Ships Today. 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 C48A403564 — Ships Today?

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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OEM Carrier Transformer 40VA 120V to 24V for C48A403564 — Ships Today

OEM Carrier 40VA Control Transformer for Model C48A403564

Shipping Information

Return Policy

Frequently Asked Questions