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OEM Carrier Control Transformer 40VA 208/240V–24V for PY3GNAA60090AA
Carrier

OEM Carrier Control Transformer 40VA 208/240V–24V for PY3GNAA60090AA

SKU: CARRIE-PY3GNAA60090AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNAA60090AA — 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 — HT01BD209 for Model PY3GNAA60090AA

The Carrier HT01BD209 control transformer is the factory-specified OEM replacement for the Carrier PY3GNAA60090AA packaged HVAC system. This transformer steps high-voltage line power (208/240V) down to the 24V signal used by your thermostat, control board, contactor coil, and all other low-voltage components. When it fails, nothing in the control circuit responds — the system will appear completely dead even with line voltage present at the unit. A blown fuse on the secondary side is the most common symptom, often caused by a short in the low-voltage wiring.

  • Specs: 40VA output | 208/240V primary | 24V secondary | 50/60Hz | OEM part number HT01BD209 | Replaces HT01BD207, HT01CN232, and 9076-00
  • OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers frequently underperform at rated VA load, causing nuisance low-voltage faults, premature contactor coil burnout, and control board instability.
  • Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting. Always check for a short in the low-voltage circuit before powering up the replacement to avoid blowing the secondary fuse again.
  • Warranty: 1-year OEM factory warranty. Orders placed before 3PM ship same business day from our warehouse.

Compatibility: Engineered as a direct OEM fit for Carrier model PY3GNAA60090AA. Verify your unit's data plate shows 208/240V primary input and a 40VA, 24V secondary before ordering. Bryant and Payne units sharing this transformer platform are also covered. Our fitment team is available to confirm compatibility before you buy — no guesswork.

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 PY3GNAA60090AA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNAA60090AA. 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 PY3GNAA60090AA?
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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