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OEM Carrier Transformer 40VA 230/115V 24V Sec — 09DE044900
Carrier

OEM Carrier Transformer 40VA 230/115V 24V Sec — 09DE044900

SKU: CARRIE-09DE044900-TRANSFORMER-HT01BC208 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BC208 for Model 09DE044900

This OEM control transformer (part number HT01BC208) is the factory-specified replacement for the Carrier 09DE044900. The transformer steps down high-voltage line power — either 230V or 115V primary — to the 24V AC signal that energizes the entire low-voltage control circuit: thermostat, contactor coil, gas valve, and board logic. When this transformer fails, the entire system goes dark — no thermostat response, no staging, no operation whatsoever. It is often the first component to diagnose when a unit shows zero control activity despite confirmed line voltage.

  • Specs: 40VA output | Dual primary: 230V / 115V | 24V secondary | 60 Hz | Part No. HT01BC208 | Cross-ref: 320659-301, 2-05757-1
  • OEM vs Generic: OEM transformers are wound to exact factory VA ratings and insulation class. Undersized or off-spec generic units can overheat under full control load, tripping thermal cutoffs and causing intermittent faults that are difficult to diagnose.
  • Install difficulty: 2/5 — Shut off all power and confirm zero voltage before disconnecting wires. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all wire connections before removal. Verify primary tap selection (230V vs 115V) matches your unit's supply voltage.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for Carrier model 09DE044900. Confirm your unit's supply voltage matches the correct primary tap (230V or 115V) before installation. Cross-references: 320659-301, 2-05757-1. Not sure it fits? Our fitment team verifies compatibility before you order — reach out before purchasing.

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 OEM Carrier Transformer 40VA 230/115V 24V Sec — 09DE044900?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Transformer 40VA 230/115V 24V Sec — 09DE044900. 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 OEM Carrier Transformer 40VA 230/115V 24V Sec — 09DE044900?
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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