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OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA048115AA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA048115AA

SKU: CARRIE-PY3GNA048115AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNA048115AA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD209 for Model PY3GNA048115AA

The Carrier HT01BD209 is the factory-specified OEM control transformer for the Carrier PY3GNA048115AA packaged unit. This transformer steps down the 208/240V line voltage to the 24V AC signal that powers your thermostat, control board, gas valve, and every other low-voltage component in the system. When this transformer fails — due to a short in the control circuit, age, or overload — the result is complete system shutdown: the thermostat goes blank, the unit will not respond to any call for heating or cooling, and no low-voltage components operate.

  • Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60Hz | OEM part number HT01BD209
  • OEM vs Generic: The OEM HT01BD209 is wound to Carrier's exact VA rating and insulation class, ensuring the secondary voltage holds steady under full control-circuit load. Generic transformers often underrate their true VA capacity, causing voltage sag that triggers nuisance lockouts and premature board failures.
  • Install difficulty: 2/5 — Switch off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (verify 0V before touching wires). Label or photograph all low-voltage wiring before disconnecting. Check for any short in the 24V circuit that may have caused the original failure before installing the new transformer.
  • Warranty: 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier PY3GNA048115AA packaged units. Also replaces legacy Carrier part number HT01CN232. Verify your unit's model and data plate before ordering — our team is available to confirm fitment. Order today for same-day shipping and get your system back online fast.

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 PY3GNA048115AA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNA048115AA. 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 PY3GNA048115AA?
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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