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OEM Carrier Transformer 40VA 208/240V–24V for PY3GPAA60090AA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3GPAA60090AA

SKU: CARRIE-PY3GPAA60090AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GPAA60090AA — 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 PY3GPAA60090AA

This is the factory OEM replacement control transformer (part number HT01BD209) for the Carrier PY3GPAA60090AA packaged gas/electric unit. The transformer steps down 208/240V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — resulting in a completely unresponsive thermostat, a blown low-voltage fuse, or a system that won't respond to any call for heating or cooling.

  • Specs: Input 208/240V | Output 24V | 40VA power rating | 50/60Hz | OEM part number HT01BD209 | Factory-matched wire gauge and mounting footprint
  • OEM vs Generic: The OEM transformer is wound to exact VA and voltage tolerances specified by Carrier engineering. Undersized or off-tolerance aftermarket transformers can overheat, sag voltage under load, and cause intermittent control board faults that are notoriously difficult to diagnose.
  • Install difficulty: 2/5 — Turn off all power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, needle-nose pliers, multimeter (to confirm 24V output after installation). Label or photograph all wire connections before removal. Total job time: 20–35 minutes for a qualified technician.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Verified factory fit for Carrier model PY3GPAA60090AA. Always confirm input voltage on your unit's data plate (208V or 240V) prior to ordering — this transformer supports both. Need fitment confirmation before you buy? Our HVAC parts team verifies compatibility on every order. Order by 3PM and your part ships today.

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 PY3GPAA60090AA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GPAA60090AA. 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 PY3GPAA60090AA?
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
HVAC Parts Specialist — Online