OEM Carrier 75VA Control Transformer HT01BD242 for Model PH3ZNA060000AA

This is the factory OEM replacement control transformer for the Carrier PH3ZNA060000AA packaged unit. The transformer steps down high-voltage primary power — 208V, 240V, or 480V — to the 24VAC secondary voltage that energizes the entire low-voltage control circuit: thermostat signals, contactor coils, board logic, and gas valve actuation. When this transformer fails, the result is total system lockout — nothing responds, no error codes display, and no components energize. If your system is completely unresponsive despite a live line-voltage supply, a failed transformer is the first component to test.

• Specs: 75VA rating | Primary: 208 / 240 / 480VAC | Secondary: 24VAC | 50/60 Hz | Foot-mount configuration | OEM part number HT01BD242
• OEM vs Generic: OEM transformers are wound and insulated to exact Carrier factory tolerances, ensuring stable 24V output under full VA load. Generic units often have inconsistent VA ratings that cause voltage sag, nuisance lockouts, and premature contactor coil burnout.
• Install difficulty: 2/5 — Shut off all power (line and control) before servicing. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper. Verify 24V output at secondary terminals after installation before restoring full system power. Always label and photograph all wire connections before disconnecting.
• Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Designed for the Carrier PH3ZNA060000AA packaged unit. This transformer is also used across Carrier, Bryant, Payne, Tempstar, Heil, and Comfortmaker equipment sharing the HT01BD242 specification — confirm primary voltage (208/240/480V) and 75VA rating on your unit's data plate before ordering. Our fitment team is available to verify compatibility before you buy — just ask.