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OEM Carrier 40VA Transformer 208/240V–24V HT01BD209 — PY3GNAA24060AA
Carrier

OEM Carrier 40VA Transformer 208/240V–24V HT01BD209 — PY3GNAA24060AA

SKU: CARRIE-PY3GNAA24060AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNAA24060AA — 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 — HT01BD209 for Model PY3GNAA24060AA

This is the OEM factory-specified control transformer for the Carrier PY3GNAA24060AA HVAC system. The transformer steps down high-voltage line power (208/240V) to the 24V low-voltage signal used by your thermostat, control board, and every relay in the system. When this component fails, the entire control circuit goes dark — you'll see a blank thermostat, no response to heat or cool calls, and a completely unresponsive system despite line voltage being present at the unit.

  • Specs: Input (Primary) Voltage: 208/240V | Output (Secondary) Voltage: 24V | Frequency: 50/60 Hz | Power Rating: 40VA | OEM Part Number: HT01BD209
  • OEM vs Generic: This is the genuine Carrier OEM transformer, wound to exact factory VA and voltage tolerances. Generic transformers are often rated at loose tolerances that can underpower control boards or burn out prematurely under sustained load.
  • Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph and label all wiring harness connections before removal. Verify 24V output with a multimeter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3GNAA24060AA. Always verify your unit's data plate input voltage (208V or 240V) matches this transformer's primary tap before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today 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 OEM Carrier 40VA Transformer 208/240V–24V HT01BD209 — PY3GNAA24060AA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier 40VA Transformer 208/240V–24V HT01BD209 — PY3GNAA24060AA. 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 40VA Transformer 208/240V–24V HT01BD209 — PY3GNAA24060AA?
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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