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OEM Carrier Control Transformer 40VA 208/240V–24V for PY4GPAA60115AA
Carrier

OEM Carrier Control Transformer 40VA 208/240V–24V for PY4GPAA60115AA

SKU: CARRIE-PY4GPAA60115AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY4GPAA60115AA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY4GPAA60115AA

This is the genuine OEM Carrier control transformer (part number HT01BD209), the factory-specified replacement for the Carrier PY4GPAA60115AA packaged HVAC system. The control transformer steps down high-voltage line power (208/240V) to the safe 24V signal used by your thermostat, control board, and all low-voltage components. When this transformer fails, the entire control circuit loses power — the thermostat goes dark, the system stops responding to commands, and you may notice a faint buzzing or burning smell near the air handler or packaged unit cabinet.

  • Specs: 208/240V primary input | 24V secondary output | 40VA capacity | 50/60 Hz | Class 2 control transformer | Direct OEM replacement for Carrier PY4GPAA60115AA
  • OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, protecting sensitive control boards and thermostats from under-voltage or overcurrent damage. Generic units often run outside rated VA, which can trip breakers or shorten board life.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching terminals), needle-nose pliers, and wire labels or masking tape. Photograph all wiring connections before removal. Confirm primary and secondary wire leads match your unit's wiring diagram.
  • Warranty & Shipping: 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY4GPAA60115AA packaged HVAC unit. Also replaces legacy Carrier part numbers HT01BD207, HT01CN232, and 9076-00 — verify your existing part number and unit data plate before ordering. Not sure if this fits? Contact our parts team and we'll confirm fitment 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 PY4GPAA60115AA?
Yes. This is the factory-specified OEM transformer for the Carrier PY4GPAA60115AA. 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 PY4GPAA60115AA?
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