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OEM Carrier Transformer 75VA 208/240/480V–24V for PH2PNB030000AB
Carrier

OEM Carrier Transformer 75VA 208/240/480V–24V for PH2PNB030000AB

SKU: CARRIE-PH2PNB030000AB-TRANSFORMER-HT01BD242 Brand: Carrier
✓ Guaranteed to fit PH2PNB030000AB — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 75VA 208/240/480V to 24VAC for Model PH2PNB030000AB

This OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the Carrier PH2PNB030000AB packaged heat pump and rooftop unit. The transformer steps down high-voltage line power (208/240/480V) to the 24VAC signal required by thermostats, control boards, contactors, and every other low-voltage component in the control circuit. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, nothing responds to a call for heating or cooling, and the unit appears completely dead despite line voltage being present at the unit.

  • Specs: 75VA power rating | Input: 208/240/480V, 50/60Hz | Output: 24VAC | Foot-mount configuration | OEM part #HT01BD242
  • OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Undersized or off-spec generic transformers can overheat under peak control-circuit load, blow the internal fuse, and damage downstream boards — making OEM the only reliable long-term choice.
  • Install difficulty: 3/5 — Disconnect and lock out all power before proceeding. Tools needed: multimeter (verify 0V before touching wires), flathead and Phillips screwdrivers, wire nuts or terminal connectors. Photograph all wiring connections before removal. Verify primary voltage tap matches your supply voltage (208/240 or 480V) before energizing.
  • Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PH2PNB030000AB packaged rooftop/heat pump unit. This transformer is also used across multiple Carrier, Bryant, and Payne platforms — verify your unit's supply voltage and confirm the HT01BD242 part number on your existing transformer's label before ordering. Not sure it fits? Our HVAC parts team verifies fitment before you buy — contact us today and ship with confidence.

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 PH2PNB030000AB?
Yes. This is the factory-specified OEM transformer for the Carrier PH2PNB030000AB. 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 PH2PNB030000AB?
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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