Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier 40VA Transformer 120V–24V for SUBCLR50HJ440684
Carrier

OEM Carrier 40VA Transformer 120V–24V for SUBCLR50HJ440684

SKU: CARRIE-SUBCLR50HJ440684-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit SUBCLR50HJ440684 — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 40VA Control Transformer 120V–24V for Model SUBCLR50HJ440684

This OEM Carrier transformer (part number HT01BD209) is the factory-specified replacement for the SUBCLR50HJ440684 unit. The transformer steps down 120V line voltage to the 24V control circuit voltage that powers your thermostat, contactor coils, and all low-voltage safety controls. When this component fails, the entire control circuit loses power — symptoms include a completely unresponsive thermostat, a system that won't turn on at all, or tripped low-voltage fuses with no apparent cause.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD209 | Factory-matched for SUBCLR50HJ440684
  • OEM vs Generic: This OEM transformer is wound and rated to exact Carrier factory tolerances, ensuring stable 24V output under full control-circuit load. Off-brand transformers often under-deliver VA capacity, causing nuisance lockouts and premature contactor coil failure.
  • Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label and photograph all low-voltage wiring before disconnecting. Verify 24V output at secondary terminals after installation before restoring full system power.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Direct OEM replacement for Carrier model SUBCLR50HJ440684. Always verify your unit's data plate voltage and VA requirements before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.

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

Frequently Asked Questions

Does this Transformer fit my Carrier SUBCLR50HJ440684?
Yes. This is the factory-specified OEM transformer for the Carrier SUBCLR50HJ440684. 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 SUBCLR50HJ440684?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online