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OEM Carrier Transformer 40VA 208/240V–24V for PY3PPA048115AB
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3PPA048115AB

SKU: CARRIE-PY3PPA048115AB-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PPA048115AB — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer 208/240V to 24V for Model PY3PPA048115AB

This is the factory OEM replacement control transformer for the Carrier PY3PPA048115AB packaged unit. The transformer steps down line voltage from 208/240V to the 24V signal used by your thermostat, control board, and every low-voltage component in the system. When this transformer fails, the entire control circuit loses power — resulting in a completely unresponsive thermostat, no call for heat or cooling, and a system that appears totally dead at the unit even though line voltage is present.

  • Specs: Input: 208/240V | Output: 24V | Frequency: 50/60 Hz | Power Rating: 40VA | OEM Part Number: HT01BD209
  • OEM vs Generic: This OEM transformer is factory-wound to exact Carrier VA and voltage tolerances. Off-brand replacements can deliver unstable 24V output, causing nuisance lockouts, erratic thermostat behavior, and premature control board failure.
  • Install difficulty: 2/5 — Always shut off all power before starting. Tools needed: multimeter, flathead and Phillips screwdrivers, wire strippers, needle-nose pliers. Verify 24V output across secondary terminals after installation before restoring full system power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY3PPA048115AB. Also fits additional Carrier, Bryant, and Payne models using the HT01BD209 specification — verify your unit's data plate voltage and VA rating before ordering. Our fitment team is available to confirm compatibility before you buy.

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 PY3PPA048115AB?
Yes. This is the factory-specified OEM transformer for the Carrier PY3PPA048115AB. 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 PY3PPA048115AB?
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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