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OEM Carrier Control Transformer 40VA 208/240V–24V — SUBCLR50HJ440080
Carrier

OEM Carrier Control Transformer 40VA 208/240V–24V — SUBCLR50HJ440080

SKU: CARRIE-SUBCLR50HJ440080-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit SUBCLR50HJ440080 — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 208/240V to 24V for Model SUBCLR50HJ440080

This OEM control transformer (part# HT01BD209) is the factory-specified replacement for the Carrier SUBCLR50HJ440080 HVAC system. The transformer steps down line-voltage power (208/240V) to the 24V low-voltage signal used by your thermostat, control board, gas valve, and all other 24V components. When this transformer fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat communication, no ignition sequence, and no heating or cooling operation. If your system is totally dead with no 24V at the control board, this transformer is the first part to test and replace.

  • Specs: 40VA rating | 208/240V primary input | 24V secondary output | 50/60Hz | OEM part# HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
  • OEM vs Generic: This OEM unit is factory-wound to exact VA and voltage tolerances. Under-rated or off-tolerance generic transformers can overheat, trip thermal cutoffs prematurely, or deliver unstable 24V — causing nuisance lockouts or damaging downstream controls.
  • Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Label or photograph all wire connections before removal. Wires connect to screw terminals — straightforward swap.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for Carrier model SUBCLR50HJ440080. Always verify your unit's data plate voltage requirements before ordering — some configurations may use 208V or 240V primary. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order. Order now and ship 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 $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 OEM Carrier Control Transformer 40VA 208/240V–24V — SUBCLR50HJ440080?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Control Transformer 40VA 208/240V–24V — SUBCLR50HJ440080. 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 Control Transformer 40VA 208/240V–24V — SUBCLR50HJ440080?
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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