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OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA048090NA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA048090NA

SKU: CARRIE-PY3GNA048090NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNA048090NA — 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 — Model PY3GNA048090NA

This OEM Carrier control transformer (part # HT01BD209) is the factory-specified replacement for the Carrier PY3GNA048090NA packaged HVAC unit. The transformer steps down line voltage from 208/240V to the 24V required to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the result is a completely unresponsive system: the thermostat goes blank, no signals reach any components, and the unit will not heat, cool, or circulate air.

  • Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | Factory OEM part # HT01BD209 — exact form, fit, and function match
  • OEM vs Generic: OEM transformers are wound to Carrier's exact VA and impedance specifications, ensuring proper inrush current handling and protection against control circuit overloads. Generic alternatives may be under-rated, leading to premature failure or nuisance tripping.
  • Install difficulty: 2/5 — Shut off all power to the unit at the disconnect and breaker before beginning. Tools needed: flat-head and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring connections before disconnecting. Swap wire-for-wire on the secondary terminals.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GNA048090NA packaged unit. Verify input voltage on your unit's data plate (208V or 240V) before ordering — this transformer supports both. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you order. Order now and ship 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 PY3GNA048090NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNA048090NA. 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 PY3GNA048090NA?
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