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OEM Carrier Control Transformer 40VA 208/230V–24V — PY3PNA048090NB
Carrier

OEM Carrier Control Transformer 40VA 208/230V–24V — PY3PNA048090NB

SKU: CARRIE-PY3PNA048090NB-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PNA048090NB — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 208/230V to 24V for Model PY3PNA048090NB

This is the genuine OEM Carrier control transformer (part #HT01BD209) factory-specified for the Carrier PY3PNA048090NB packaged unit. The transformer steps down 208/230V line voltage to the 24V DC signal that powers your thermostat, control board, contactors, and all low-voltage control wiring. When this component fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heating or cooling, and nothing turns on. A failed transformer is one of the most common reasons an otherwise healthy HVAC system appears completely unresponsive.

  • Specs: 40VA capacity | 208/230V primary input | 24V secondary output | 50/60 Hz rated | OEM part number HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
  • OEM vs Generic: The OEM HT01BD209 is factory-wound to exact impedance and VA tolerances for the PY3PNA048090NB. Generic alternatives may run slightly under-rated VA, causing the transformer to overheat under simultaneous thermostat + contactor + board load — leading to premature failure and blown fuses.
  • Install difficulty: 2/5 — Disconnect power at the breaker and verify with a multimeter before touching any wiring. Photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Check the 3A control-circuit fuse on the board before condemning the transformer — a shorted low-voltage device can blow both.
  • Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered by 3PM local time.

Compatibility: Engineered as the factory-direct replacement for the Carrier PY3PNA048090NB packaged unit. Also compatible with select Bryant and Payne models sharing the same 40VA 208/230V transformer specification — verify your unit's data plate before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy. Order now — in stock and 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 OEM Carrier Control Transformer 40VA 208/230V–24V — PY3PNA048090NB?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Control Transformer 40VA 208/230V–24V — PY3PNA048090NB. 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 208/230V–24V — PY3PNA048090NB?
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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