OEM Carrier Control Transformer 75VA 208/240/480V to 24VAC for Model PH4GNXB60000AA

This OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the Carrier PH4GNXB60000AA packaged unit. The transformer steps high-voltage primary power (208/240/480V) down to the 24VAC signal voltage that powers every low-voltage control circuit in your system — including the thermostat, contactor coil, control board, and safety switches. When this transformer fails, the entire control circuit goes dead: the thermostat loses power, the system won't respond to any commands, and you may detect a faint burnt-electrical smell or audible buzzing from the transformer body itself.

• Specs: 75VA rating | Primary: 208/240/480V multi-tap | Secondary: 24VAC | 50/60Hz | Foot-mount configuration | OEM part #HT01BD242
• OEM vs Generic: This is a genuine Carrier factory part engineered to exact winding and insulation specifications. Off-brand substitutes often run at looser VA tolerances, risking coil overheating and nuisance control failures — especially under peak-load seasons.
• Install Difficulty: 3/5 — Always shut off all power at the disconnect before servicing. Tools needed: multimeter (verify 0V before touching terminals), flat-head and Phillips screwdrivers, wire stripper, needle-nose pliers. Confirm primary tap wiring matches your supply voltage before energizing. Recommend a licensed HVAC technician for this repair.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as the direct OEM replacement for Carrier model PH4GNXB60000AA packaged units. Always verify your supply voltage matches an available primary tap (208V, 240V, or 480V) and confirm the 75VA rating on your unit's data plate before ordering. Our parts team is available to verify fitment — order with confidence and get it shipped today.