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OEM Carrier Control Transformer 40VA 208/240V–24V — SUBCLR50HJ440030
Carrier

OEM Carrier Control Transformer 40VA 208/240V–24V — SUBCLR50HJ440030

SKU: CARRIE-SUBCLR50HJ440030-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit SUBCLR50HJ440030 — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer 208/240V to 24V for Model SUBCLR50HJ440030

This is the genuine OEM Carrier control transformer (part number HT01BD209), the factory-specified replacement for the SUBCLR50HJ440030. The transformer steps down line voltage from 208/240V to the 24V needed to power your thermostat, control board, and all low-voltage system components. When this part fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat display, no contactor pull-in, and no heating or cooling whatsoever. A quick 24V check at the transformer's secondary terminals with a multimeter will confirm whether this part is the culprit.

  • Specs: 208/240V Primary | 24V Secondary | 40VA rated | 50/60 Hz | Class 2 control transformer | Replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00
  • OEM vs Generic: OEM transformers are wound to exact factory VA ratings, ensuring the secondary stays at a stable 24V under full load. Undersized or off-brand units can sag under load, causing intermittent lockouts, nuisance tripping, and premature control board failures.
  • Install Difficulty: 2/5 — Shut off all power to the unit before starting. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper, and insulated terminals. Label each wire before disconnecting. Verify 24V output at secondary terminals before closing the panel.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — in stock and ready to go.

Compatibility: Designed as a direct OEM fit for Carrier model SUBCLR50HJ440030. Cross-references HT01BD207, HT01CN232, and 9076-00. Always verify your unit's existing transformer specs (input voltage, output voltage, and VA rating) against your data plate before ordering. Our parts specialists are available to confirm fitment — just reach out before you buy.

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 — SUBCLR50HJ440030?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Control Transformer 40VA 208/240V–24V — SUBCLR50HJ440030. 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 — SUBCLR50HJ440030?
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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