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OEM Carrier Transformer 75VA 208/240/480V–24V for PH3GNAA24000AA
Carrier

OEM Carrier Transformer 75VA 208/240/480V–24V for PH3GNAA24000AA

SKU: CARRIE-PH3GNAA24000AA-TRANSFORMER-HT01BD242 Brand: Carrier
✓ Guaranteed to fit PH3GNAA24000AA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 75VA Control Transformer HT01BD242 for Model PH3GNAA24000AA

This OEM Carrier transformer (part #HT01BD242) is the factory-specified 24V control circuit transformer for the Carrier PH3GNAA24000AA packaged unit. The transformer steps down high-voltage line power (208/240/480V primary) to the 24V AC signal that energizes your thermostat, contactor coil, gas valve, and all control board logic. When this transformer fails, the entire control circuit goes dead — the system will not respond to any thermostat call, nothing will energize, and you may measure 0V across the 24V secondary terminals. It is one of the first components to check on a completely unresponsive unit.

  • Specs: 75VA rating | Primary: 208/240/480V | Secondary: 24VAC | 50/60Hz | Foot-mount configuration | OEM part #HT01BD242
  • OEM vs Generic: This is the genuine Carrier factory part, wound to exact VA and voltage tolerances. Generic transformers with loose VA ratings can cause nuisance tripping of downstream fuses and unstable contactor operation — OEM ensures factory-matched performance and longevity.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before touching any wiring. Tools needed: flathead and Phillips screwdriver, multimeter, wire stripper. Photograph all wiring connections before removal. Confirm secondary output reads 24–28VAC after installation before closing the cabinet.
  • Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PH3GNAA24000AA packaged unit. This transformer also crosses to Bryant, Payne, and ICP family equipment sharing the HT01BD242 specification — always verify primary voltage (208/240/480V) and VA rating (75VA) on your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back online fast.

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 PH3GNAA24000AA?
Yes. This is the factory-specified OEM transformer for the Carrier PH3GNAA24000AA. 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 PH3GNAA24000AA?
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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