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OEM Carrier Control Transformer 40VA 208/240V-24V — PY4GPAA42060AA
Carrier

OEM Carrier Control Transformer 40VA 208/240V-24V — PY4GPAA42060AA

SKU: CARRIE-PY4GPAA42060AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY4GPAA42060AA — 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 PY4GPAA42060AA

This genuine OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY4GPAA42060AA packaged unit. The transformer steps down 208/240V line voltage to a stable 24V output that powers the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dark: the thermostat becomes unresponsive, the system won't call for heating or cooling, and nothing happens when you adjust the setpoint.

  • Specs: 208/240V Primary | 24V Secondary | 40VA rating | 50/60Hz | Part # HT01BD209 | Replaces HT01BD207, HT01CN232, 9076-00
  • OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, ensuring the control board and contactor coils receive clean, stable 24V power. Generic units can run low under load, causing nuisance lockouts and premature control board failure.
  • Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter, wire nuts or quick-connect terminals. Photograph all wiring connections before disconnecting leads. Verify primary voltage at your unit's data plate before ordering.
  • Warranty: 1-year OEM factory warranty against defects. In-stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GPAA42060AA packaged unit. This transformer is also cross-referenced to replace OEM part numbers HT01BD207, HT01CN232, and 9076-00. Always confirm the primary voltage and VA rating on your unit's data plate before ordering. Have questions about fitment? Our HVAC parts team verifies compatibility before you buy — contact us today and get your system back up 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 OEM Carrier Control Transformer 40VA 208/240V-24V — PY4GPAA42060AA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Control Transformer 40VA 208/240V-24V — PY4GPAA42060AA. 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 OEM Carrier Control Transformer 40VA 208/240V-24V — PY4GPAA42060AA?
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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