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OEM Carrier Transformer 40VA 208/240V–24V for PY3PNA048115NA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3PNA048115NA

SKU: CARRIE-PY3PNA048115NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PNA048115NA — 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 — HT01BD209 for Model PY3PNA048115NA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA048115NA packaged unit. The transformer steps down high-voltage line power to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching components. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no fault codes can even be generated. Replacing the transformer is frequently the fastest path back to a fully operational system.

  • Specs: Primary input 208/240V | Secondary output 24V | 40VA power rating | 50/60 Hz | OEM part number HT01BD209
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for the PY3PNA048115NA control circuit. Generic units with loose tolerances can under-power sensitive control boards, leading to erratic behavior or premature board failure.
  • Install difficulty: 2/5 — Turn off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph or label all wiring connections before disconnecting the old unit.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA048115NA packaged unit. Verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. Cross-references include HT01CN232 and HT01CN233. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you order — reach out 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 PY3PNA048115NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3PNA048115NA. 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 PY3PNA048115NA?
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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