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OEM Carrier Control Transformer 40VA 208/240V–24V — PY3GNA048115NA
Carrier

OEM Carrier Control Transformer 40VA 208/240V–24V — PY3GNA048115NA

SKU: CARRIE-PY3GNA048115NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNA048115NA — 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 PY3GNA048115NA

The Carrier HT01BD209 is the factory-specified 40VA step-down control transformer for the PY3GNA048115NA packaged HVAC unit. This transformer converts the line-voltage power supply (208/240V primary) down to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the system goes completely silent: no thermostat display, no blower, no heating or cooling response. A failed transformer is often traced to a shorted control wire or a failed component that caused an overcurrent event, so always inspect the control circuit before installing the replacement.

  • Specs: OEM Part # HT01BD209 | Input: 208/240V AC | Output: 24V AC | Rating: 40VA | Frequency: 50/60 Hz | Factory-matched to Carrier PY3GNA048115NA
  • OEM vs Generic: This is the genuine Carrier OEM transformer, wound and insulated to factory specifications. Generic transformers rated at 40VA can exhibit voltage sag under full control-circuit load, leading to erratic thermostat behavior or nuisance lockouts — a risk the OEM unit eliminates.
  • Install Difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output and check for control circuit shorts before energizing). Always inspect low-voltage wiring for chafing or shorts prior to installation.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PY3GNA048115NA packaged HVAC unit. Verify your unit's data plate voltage ratings (208/240V primary, 24V secondary, 40VA) before ordering. Not sure it's the right part? Our HVAC parts specialists are available to confirm fitment before you buy — call or chat today for same-day shipping assistance.

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 — PY3GNA048115NA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Control Transformer 40VA 208/240V–24V — PY3GNA048115NA. 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 — PY3GNA048115NA?
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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