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OEM Carrier Transformer 40VA 208/230V–24V for SUBCLR50HJ402457
Carrier

OEM Carrier Transformer 40VA 208/230V–24V for SUBCLR50HJ402457

SKU: CARRIE-SUBCLR50HJ402457-TRANSFORMER-HT01BD209 Brand: Carrier

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 208/230V to 24V — HT01BD209 for Model SUBCLR50HJ402457

This genuine OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier SUBCLR50HJ402457 HVAC system. The transformer steps down the unit's primary 208/230V supply voltage to the 24V signal required by the thermostat, control board, contactor coil, and all other low-voltage components. When this part fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, a system that won't energize at all, or a tripped low-voltage fuse caused by a shorted secondary winding.

  • Specs: 208/230V Primary | 24V Secondary | 40VA Rated | 50/60Hz | Class 2 control transformer — exact OEM factory specification for SUBCLR50HJ402457
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances. Under-rated generic transformers overheat, blow fuses, and can damage sensitive control boards. This is the same part Carrier installed at the factory.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all wiring connections before disconnecting. The transformer typically mounts in the air handler or furnace cabinet with two screws. Reconnect primary (line voltage) and secondary (24V) wires per the original wiring diagram.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered to fit Carrier model SUBCLR50HJ402457. Also replaces superseded Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Confirm your unit's model number and voltage requirements on the data plate before ordering. Our parts specialists are available to verify fitment — order with confidence and get your system back online today.

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 SUBCLR50HJ402457?
Yes. This is the factory-specified OEM transformer for the Carrier SUBCLR50HJ402457. 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 SUBCLR50HJ402457?
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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