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OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA042060AA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA042060AA

SKU: CARRIE-PY3GNA042060AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNA042060AA — 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 — Model PY3GNA042060AA

The Carrier HT01BD209 is the factory OEM control transformer for the Carrier PY3GNA042060AA and related HVAC systems. This transformer steps down the 208/240V line voltage to a clean 24V output that powers the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and safety switches. When this transformer fails, the result is often a completely unresponsive system: the thermostat goes blank, no relay clicks, and the unit refuses to start at all. A failed transformer may also blow the 3A control fuse repeatedly, making it easy to misdiagnose as a wiring or board problem.

  • Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | OEM part number HT01BD209 | Also supersedes HT01CN232 and HT01CN233
  • OEM vs Generic: OEM transformers are wound to exact Carrier tolerances, ensuring stable 24V output under load. Undersized or off-spec aftermarket units can sag under peak current draw, causing nuisance lockouts and premature contactor coil failure.
  • Install Difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output post-install). Label and photograph all wiring before disconnecting. Total job time: approximately 20–30 minutes.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Engineered as a direct OEM drop-in replacement for the Carrier PY3GNA042060AA. Verify your unit's control voltage requirement is 24V and line voltage is 208/240V before ordering. Need fitment help? Our HVAC parts specialists verify compatibility before you buy — call or chat anytime.

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 PY3GNA042060AA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNA042060AA. 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 PY3GNA042060AA?
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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