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OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA024040AB
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA024040AB

SKU: CARRIE-PY3GNA024040AB-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNA024040AB — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNA024040AB

This is the genuine OEM Carrier replacement transformer (part #HT01BD209) factory-specified for the Carrier PY3GNA024040AB HVAC system. The control transformer steps down high-voltage line power (208/240V) to the 24V AC signal that energizes the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the result is total system lockout: the thermostat goes blank, the unit will not respond to any calls for heating or cooling, and no control components receive power.

  • Specs: Input 208/240V | Output 24V | 40VA power rating | 50/60Hz dual-frequency | OEM part number HT01BD209 | Factory-matched for Carrier PY3GNA024040AB
  • OEM vs Generic: This is a factory OEM unit built to Carrier's exact VA rating and insulation class. Generic transformers often carry loose VA tolerances that can overheat under normal control circuit loads, leading to premature burnout and repeat failures.
  • Install difficulty: 2/5 — Shut off all power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Photograph all wiring connections before disconnecting the old unit. Match wire-for-wire on reinstall.
  • Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PY3GNA024040AB. Verify your unit's data plate voltage ratings before ordering. Not sure if this is the right part? Contact our HVAC parts team — we verify fitment before you buy. Order today and get same-day shipping straight to your door.

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 PY3GNA024040AB?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNA024040AB. 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 PY3GNA024040AB?
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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