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OEM Carrier Transformer 75VA 208/240/480V–24V for PH3GPAA30000AA
Carrier

OEM Carrier Transformer 75VA 208/240/480V–24V for PH3GPAA30000AA

SKU: CARRIE-PH3GPAA30000AA-TRANSFORMER-HT01BD242 Brand: Carrier
✓ Guaranteed to fit PH3GPAA30000AA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 75VA Control Transformer HT01BD242 for Model PH3GPAA30000AA

This OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the Carrier PH3GPAA30000AA packaged HVAC unit. The transformer steps down high-voltage line power — 208, 240, or 480V primary — to the 24V AC secondary signal that energizes your system's entire control circuit, including the thermostat, contactor coils, and safety switches. When this part fails, absolutely nothing responds: the thermostat goes dark, the system refuses to start, and no safety components receive power. It is one of the first parts to test when a unit goes completely unresponsive.

  • Specs: 75VA rating | 208/240/480V primary input | 24V AC secondary output | 50/60 Hz | Foot-mount configuration | OEM part number HT01BD242
  • OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers can deviate in VA capacity and insulation rating, risking premature burnout under full control-circuit load — especially in multi-stage packaged units like the PH3GPAA30000AA.
  • Install difficulty: 3/5 — Requires shutting off power at the disconnect before any work. Label and photograph all 24V low-voltage wiring before disconnecting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Licensed technician installation strongly recommended.
  • Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed for the Carrier PH3GPAA30000AA packaged unit. The 75VA, 208/240/480V-to-24V specification also makes this transformer a cross-compatible fit for select Bryant, Payne, and ICP family units — always verify your data plate VA rating and primary voltage before ordering. Have questions about fitment? Our HVAC parts specialists 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 PH3GPAA30000AA?
Yes. This is the factory-specified OEM transformer for the Carrier PH3GPAA30000AA. 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 PH3GPAA30000AA?
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