What are the specs for this Transformer?

The correct replacement for Carrier model C48A504052 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 C48A504052.

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/24V for C48A504052

Name: OEM Carrier Transformer 40VA 120V/24V for C48A504052
Brand: Carrier
SKU: CARRIE-C48A504052-TRANSFORMER-HT01BD236
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-C48A504052-TRANSFORMER-HT01BD236 Brand: Carrier

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OEM Carrier 40VA Control Transformer HT01BD236 for Model C48A504052

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Carrier C48A504052 packaged unit. It converts 120V line voltage to the 24V signal required to power the control board, thermostat circuit, and all low-voltage components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and no fault codes will display. A failed transformer is often misdiagnosed as a control board failure, making this an essential first diagnostic step.

Specs: 40VA rated | 120V primary / 24V secondary | Hardwired leads | Factory-matched output tolerance for stable low-voltage control signal
OEM vs Generic: This OEM Carrier transformer (HT01BD236) is wound to exact factory VA and voltage specifications. Generic transformers may deliver unstable 24V output, causing erratic thermostat behavior, contactor chatter, or nuisance lockouts that are difficult to diagnose.
Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Confirm 24V output at secondary leads after installation before restoring full power.
Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier C48A504052 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment before you purchase — no guesswork required.

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 C48A504052?

Yes. This is the factory-specified OEM transformer for the Carrier C48A504052. 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 C48A504052?

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/24V for C48A504052

OEM Carrier 40VA Control Transformer HT01BD236 for Model C48A504052

Shipping Information

Return Policy

Frequently Asked Questions