What are the specs for this Transformer?

The correct replacement for Carrier model 09DE044100 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 09DE044100.

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 Control Transformer 40VA 230V for 09DE044100

Name: OEM Carrier Control Transformer 40VA 230V for 09DE044100
Brand: Carrier
SKU: CARRIE-09DE044100-TRANSFORMER-HT01BC208
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-09DE044100-TRANSFORMER-HT01BC208 Brand: Carrier

✓ Guaranteed to fit 09DE044100 — or your money back. Terms

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OEM Carrier Control Transformer 40VA 230V — HT01BC208 for Model 09DE044100

This is the OEM factory-specified control transformer for the Carrier 09DE044100. The transformer steps down the primary supply voltage to the 24V secondary signal that powers your thermostat, control board, contactors, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dead — the thermostat loses power, nothing responds to a call for heating or cooling, and the system appears completely inoperative.

Specs: 40VA rating | 230V primary input | 115V secondary output | 50/60 Hz | OEM Part # HT01BC208 | Cross-references: 320659-301, 2-05757-1
OEM vs Generic: This is a genuine Carrier OEM transformer meeting exact factory VA and voltage tolerances. Generic transformers often run under-rated VA, causing overheating, nuisance tripping of the built-in fuse, and premature control board damage — always choose OEM for a long-term fix.
Install difficulty: 2/5 — Shut off all power to the unit before starting. Label and photograph all low-voltage wiring before disconnecting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to confirm 24V output after installation. Check for a shorted low-voltage wire (common transformer killer) before energizing.
Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse stock.

Compatibility: Designed for the Carrier 09DE044100. Verify your unit's data plate primary voltage and VA requirement match HT01BC208 specifications before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us anytime.

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 $99
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 Control Transformer ...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier 09DE044100?

Yes. This is the factory-specified OEM transformer for the Carrier 09DE044100. 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 09DE044100?

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 Control Transformer 40VA 230V for 09DE044100

OEM Carrier Control Transformer 40VA 230V — HT01BC208 for Model 09DE044100

Shipping Information

Return Policy

Frequently Asked Questions