Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier Control Transformer 75VA 208/240/480V for PH3GNAA30000AA
Carrier

OEM Carrier Control Transformer 75VA 208/240/480V for PH3GNAA30000AA

SKU: CARRIE-PH3GNAA30000AA-TRANSFORMER-HT01BD242 Brand: Carrier
✓ Guaranteed to fit PH3GNAA30000AA — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 75VA 208/240/480V to 24V for Model PH3GNAA30000AA

This OEM control transformer is the factory-specified replacement for the Carrier PH3GNAA30000AA packaged unit. The transformer steps down high-voltage primary power (208/240/480V) to the 24VAC signal required by the low-voltage control circuit — powering your thermostat, contactor coil, and all safety control boards. When it fails, the entire control circuit goes dark: the thermostat loses power, the system won't respond to any call for heating or cooling, and you may notice a faint burning smell or visible scorch marks on the transformer body.

  • Specs: 75VA rating | Primary: 208/240/480V | Secondary: 24VAC | 50/60 Hz | Foot-mount configuration | OEM Part #HT01BD242
  • OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Undersized or off-tolerance aftermarket units can overheat under full control-circuit load, tripping internal breakers or failing prematurely — especially on multi-stage systems drawing higher 24V current.
  • Install difficulty: 3/5 — Always disconnect main power at the disconnect box before servicing. Tools needed: multimeter (to confirm 0V before touching terminals), flathead and Phillips screwdrivers, wire stripper, needle-nose pliers. Label all 24V low-voltage wires before removal. Torque terminals firmly to avoid loose connections that cause overheating.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PH3GNAA30000AA packaged units. The 75VA rating and multi-tap primary (208/240/480V) make this transformer suitable for commercial and light-commercial voltage configurations. Always verify your unit's data plate voltage before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — call or chat 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 PH3GNAA30000AA?
Yes. This is the factory-specified OEM transformer for the Carrier PH3GNAA30000AA. 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 PH3GNAA30000AA?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online