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OEM Carrier Transformer 40VA 208/240V–24V for PY3PNA048130NA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3PNA048130NA

SKU: CARRIE-PY3PNA048130NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PNA048130NA — 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 PY3PNA048130NA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA048130NA packaged unit. The transformer steps down 208/240V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and every other low-voltage component in the system. When it fails, the entire control circuit goes dead — the thermostat goes blank, the unit will not respond to any call for heating or cooling, and no low-voltage components will operate.

  • Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | Direct OEM replacement for superseded part HT01CN232
  • OEM vs Generic: This factory OEM transformer is wound to exact Carrier tolerances, ensuring stable 24V output under full load. Generic transformers often exhibit voltage sag under peak demand, causing nuisance lockouts, erratic thermostat behavior, and premature control board failure.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph wiring and label leads before disconnecting the old transformer. Verify 24V output with a multimeter after installation before reassembling the unit.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3PNA048130NA packaged unit. Verify your existing transformer's primary voltage and VA rating on the unit data plate before ordering — this unit is rated 208/240V primary, 24V secondary, 40VA. Our team is happy to confirm fitment before you order. Order by 3PM and your part ships 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 PY3PNA048130NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3PNA048130NA. 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 PY3PNA048130NA?
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
HVAC Parts Specialist — Online