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OEM Carrier Control Transformer 40VA 208/240V for PY3GNAA42060NA
Carrier

OEM Carrier Control Transformer 40VA 208/240V for PY3GNAA42060NA

SKU: CARRIE-PY3GNAA42060NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNAA42060NA — 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 for Model PY3GNAA42060NA

This OEM control transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3GNAA42060NA packaged unit. The transformer steps down 208/240V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — the thermostat gets no power, the system will not respond to any call for heating or cooling, and no diagnostic fault codes will appear. A blown fuse on the secondary side is often the first clue; a dead transformer is frequently the root cause.

  • Specs: 208/240V primary | 24V secondary | 40VA capacity | 50/60 Hz | Replaces OEM part numbers HT01BD207 and HT01CN232
  • OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and impedance specs. Generic substitutes may be under-rated for inrush current, leading to nuisance fuse trips or premature failure under load.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and verify with a meter before touching wiring. Label or photograph all 24V secondary wiring before disconnecting. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter. Always replace the secondary fuse if one is present.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3GNAA42060NA packaged unit. Cross-references include OEM part numbers HT01BD207 and HT01CN232 — verify your existing part number on the transformer label before ordering to confirm fitment. Questions about compatibility? Our HVAC parts specialists confirm fit before you buy.

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 PY3GNAA42060NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNAA42060NA. 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 PY3GNAA42060NA?
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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