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OEM Carrier Control Transformer 40VA 208/240V–24V for PY3GNA024040NA
Carrier

OEM Carrier Control Transformer 40VA 208/240V–24V for PY3GNA024040NA

SKU: CARRIE-PY3GNA024040NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNA024040NA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNA024040NA

This OEM control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GNA024040NA HVAC system. The transformer steps down line voltage (208/240V) to the 24V signal that powers your thermostat, control board, and every low-voltage safety circuit in the unit. When this component fails, the entire control circuit goes dark — the result is a completely unresponsive system: a blank thermostat, no heating or cooling response, or a hard system lockout with no error codes.

  • Specs: 40VA capacity | Primary: 208/240V, 50/60Hz | Secondary: 24V | Direct OEM replacement for HT01BD209 | Also replaces HT01BD207, HT01CN232, and 9076-00
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic units can cause intermittent resets, nuisance trips on low-voltage safeties, or premature control board failure — choose OEM for a guaranteed fit.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wires or photograph connections before disconnecting the old transformer. Verify 24V output with a multimeter before reassembling panels.
  • Warranty: 1-year OEM factory warranty included. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GNA024040NA HVAC system. This transformer is also a verified cross-reference for systems originally specifying HT01BD207, HT01CN232, or 9076-00. Always confirm primary voltage (208V or 240V) matches your unit's data plate before ordering. Our technical team is available to verify fitment prior to purchase — no guesswork required.

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 PY3GNA024040NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNA024040NA. 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 PY3GNA024040NA?
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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