OEM Carrier Transformer 75VA 208/240/480V to 24VAC for Model PH3GNA030000AB

This OEM Carrier transformer (part #HT01BD242) is the factory-specified control circuit transformer for the Carrier PH3GNA030000AB packaged heat pump unit. It steps down the high-voltage supply (208/240/480V primary) to the 24VAC signal voltage that powers your thermostat, contactor coils, control board, and all low-voltage system controls. When this transformer fails, the entire control circuit goes dead — the thermostat loses power, the system won't respond to any calls for heating or cooling, and in many cases a tripped circuit or visible burn on the transformer body is the only clue. Replacing this part with the correct OEM unit restores factory-matched voltage regulation and protects every downstream component in the 24V circuit.

• Specs: 75VA power rating | Primary voltage: 208/240/480V multi-tap | Secondary voltage: 24VAC | Frequency: 50/60Hz | Foot-mount configuration | OEM part #HT01BD242
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances. Undersized or off-tolerance generic units can cause nuisance board lockouts, premature contactor coil failure, or chronic thermostat brownouts — costing far more than the part itself.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24VAC output post-install). Always photograph existing wiring before disconnecting. Verify primary tap is set to match your supply voltage before energizing.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as a direct OEM replacement for the Carrier PH3GNA030000AB packaged heat pump. This transformer is also used across a wide range of Carrier, Bryant, Payne, Tempstar, Heil, and Comfortmaker equipment sharing the same 75VA, 208/240/480V-to-24VAC specification — always verify your unit's data plate and existing transformer label before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.