OEM Carrier Control Transformer 75VA 208/240/480V to 24V for Model PH3GNAA60000AA

This is the factory OEM replacement transformer (part # HT01BD242) for the Carrier PH3GNAA60000AA packaged HVAC unit. The transformer steps down high-voltage line power (208/240/480V primary) to the 24V AC control circuit voltage that powers your thermostat, contactor coils, control board, and all low-voltage safety switches. When this transformer fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat display, no contactor pull-in, and no heating or cooling whatsoever. If you have 24V at the thermostat wires but nothing is responding, or you measure 0V on the secondary side of the transformer, this is your part.

• Specs: 75VA rating | Primary: 208/240/480V (50/60Hz) | Secondary: 24VAC | Foot-mount design | Factory-matched output tolerance for reliable control circuit protection
• OEM vs Generic: OEM transformers use factory-wound coils with precise VA ratings. Undersized or off-tolerance aftermarket units can overload under peak control circuit demand, causing nuisance trips or premature failure of downstream components.
• Install Difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: multimeter, flathead and Phillips screwdrivers, wire nuts or spade connectors. Always photograph existing wiring before disconnecting leads. Verify primary voltage tap matches your supply voltage.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PH3GNAA60000AA packaged unit. Also fits a broad range of Carrier, Bryant, Payne, ICP, Heil, Tempstar, and Comfortmaker systems using the HT01BD242 transformer. Always verify your unit's data plate primary voltage (208V, 240V, or 480V) before ordering to confirm correct tap selection. Have questions about fitment? Our parts specialists verify compatibility before you order — contact us today.