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OEM Carrier 40VA Transformer 208/240V–24V for PY3PNA030040NA
Carrier

OEM Carrier 40VA Transformer 208/240V–24V for PY3PNA030040NA

SKU: CARRIE-PY3PNA030040NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PNA030040NA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BD209 for Model PY3PNA030040NA

This OEM Carrier transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA030040NA packaged unit. The control transformer steps down line voltage from 208/240V to the 24V signal voltage that powers your thermostat, contactor coils, gas valve, and control board. When this transformer fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and nothing runs. It is often one of the first components to check when you have a completely unresponsive system despite confirmed line voltage at the unit.

  • Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60Hz | OEM part #HT01BD209 — factory-matched for exact fit and performance
  • OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Aftermarket units often run marginal VA ratings that sag under load, causing nuisance control board lockouts and premature contactor coil failures.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph or label all wire connections before removing the old transformer. Verify 24V output with a multimeter before reassembling panels.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA030040NA packaged unit. Always verify your unit's data plate voltage and VA requirements before ordering. Not sure if this part fits your system? Our HVAC parts specialists verify fitment before you buy — contact us today and get your system back online fast.

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 PY3PNA030040NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3PNA030040NA. 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 PY3PNA030040NA?
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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