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OEM Carrier Transformer 40VA 208/230V–24V for PY3GPAA30040AA
Carrier

OEM Carrier Transformer 40VA 208/230V–24V for PY3GPAA30040AA

SKU: CARRIE-PY3GPAA30040AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GPAA30040AA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD209 for Model PY3GPAA30040AA

This genuine OEM Carrier transformer (part number HT01BD209) is the factory-specified replacement for the Carrier PY3GPAA30040AA packaged unit. The control transformer steps down line voltage from 208/230V primary to a stable 24V secondary output at 40VA, powering the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the system goes completely unresponsive: no call-for-cooling, no call-for-heating, and no 24V signal to any downstream component. A blown fuse on the secondary side or a completely dead control board are the most common symptoms pointing directly to transformer failure.

  • Specs: 208/230V Primary | 24V Secondary | 40VA Rating | 50/60 Hz | Factory OEM tolerance — direct plug-and-play fitment for PY3GPAA30040AA
  • OEM vs Generic: OEM transformers maintain precise secondary voltage under load fluctuations. Generic units can sag under peak draw, causing erratic control board behavior and nuisance lockouts. This is a genuine Carrier part — no guesswork on fitment or output stability.
  • Install Difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire labels or tape. Always verify 0V at terminals before touching wiring. Label all low-voltage leads before disconnecting. Test secondary output (should read ~24–28V AC) after installation before closing the panel.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Confirmed fit for Carrier model PY3GPAA30040AA. Also replaces legacy Carrier part numbers HT01BD207, HT01CN232, and 9076-00. Verify your unit's data plate voltage before ordering — this transformer is rated for 208/230V primary input only. Not compatible with 460V or 575V primary applications. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — no returns needed.

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 PY3GPAA30040AA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GPAA30040AA. 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 PY3GPAA30040AA?
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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